Green’s Dictionary of Slang

clue v.

[SE clue]

(US) to inform, to tell; thus clued, aware.

[US]M. Shulman Rally Round the Flag, Boys! (1959) 188: I’ clue you [...] There’s gonna be a rumble.
[US](con. 1950) E. Frankel Band of Brothers 3: With seven days left till I had to ship out, I clue you, I had my work cut out.
[US]G. Swarthout Where the Boys Are 93: I clue you, nobody can be more fungous than middle-agers on the grape.
[US]M. Spillane Return of the Hood 56: Shaffer had clued his office staff [...] and two of them watched me go over the mug books.
[US]N. Heard Cold Fire Burning 42: ‘All you black bastards think you’re smart since ya got that nigger in the mayor’s office. But let me clue ya [...] it ain’t gonna do ya no goddamn good’.
[UK]S. Berkoff Decadence in Decadence and Other Plays (1985) 8: A private detective in case you’re not yet clued.
[US](con. 1967) Bunch & Cole Reckoning for Kings (1989) 120: Lemme clue you, son.

In phrases

clue (someone) in (v.) (also cue in)

(orig. US) to explain, to inform, to make aware.

[US]F. Kohner Gidget (2001) 40: I thought I’d better clue you in.
[US]M.A. Crane ‘Misc.’ in AS XXXIII:3 225: He supplies him with [...] a bit of information. For the last of these meanings the hipster also uses the more common clueing him.
[US]W. Motley Let No Man Write My Epitaph (1960) 211: They wised me up. They cued me in, you know.
[US]G. Swarthout Where the Boys Are 201: It’s back to the ratrace. But I clue you in, you guys can have that slush.
[US]F. Kohner Affairs of Gidget 112: Don’t get bombed before I clue you in on something.
[US]K. Marlowe Mr Madam (1967) 121: I got clued in about everything and everybody.
[US]‘Hy Lit’ Hy Lit’s Unbelievable Dict. of Hip Words 9: clue you in – To be informed; told; someone drops the dime in your direction.
[US]Fantastic Four Annual 44: Clue me in, Stretcho!
[US]G.V. Higgins Patriot Game (1985) 51: So that when one of his buddies clues him in, he will see that you’ve got light cream in your veins.
[US](con. 1986) G. Pelecanos Sweet Forever 253: I’ll beep Rogers [...] clue him in.
[UK]N. Cohn Yes We have No 297: He’s reluctant to clue her in.
[UK]N. Griffiths Stump 50: Just gave me this job like, said you’d clue me in.
[UK]J.J. Connolly Viva La Madness 60: Old Bill are clued-in.
[US]T. Pluck Bad Boy Boogie [ebook] ‘Next time clue me in’.
clue up (v.)

to explain something to someone; thus clued up, well aware, properly informed.

[UK]‘Neville Shute’ No Highway 115: We’ve got to jump at this decision, now juyst you and me. We can clue up the official side later .
[UK]C. MacInnes Absolute Beginners 64: You meet all kinds of cats [...] who can clue you up in all kinds of directions.
[Aus](con. 1941) R. Beilby Gunner 47: He was a school teacher in civvy life, a pretty clued-up bloke, no mug.
B. Bryson Lost Continent 112: [A] volunteer provides an interesting and well-informed commentary—and is sufficiently clued up to answer any question.
[Aus](con. 1964-65) B. Thorpe Sex and Thugs and Rock ’n’ Roll 133: Clueing her up to the rorts and rorters.
[UK]Indep. on Sun. Real Life 20 June 2: Clued-up teens are far more interested in ‘surfing’ different styles.
[UK]K. Sampson Outlaws (ms.) 172: I am the smartest, cunningest, most clued-up cunt in all of this city.
[Aus]B. Matthews Intractable [ebook] Yep, I was pretty clued up with this sex thing.
[UK]N. ‘Razor’ Smith Raiders 203: He seemed very clued up for his age.
[Aus](con. 1943) G.S. Manson Irish Fandango [ebook] ‘You seem pretty clued up on this’.

In exclamations