Green’s Dictionary of Slang

(orig. milit.) psychiatrist.

1940		Argus (Melbourne) 26 Oct. 10S: [headline] This Brave Jung Man is not a Frued: Being a True and Moving Account of the Evolutions of Two Trick Psychists.
1943		J. Agate ‘Half a Masterpiece’ in Around Cinemas 247: A medical student who doesn’t know a dying mother when he sees one is a measureless ass and can only do measureless harm when he becomes what the soldiers call a ‘trick cyclist’.
1956		‘Charles Raven’ Und. Nights 10: Is there a trick-cyclist in the club?
1962		F. Norman Guntz 28: Also on the programme was a magistrate, an ex-copper and a trick-cyclist.
1964		‘Charles Barrett’ Address: Kings Cross 126: ‘So now you think I need a trick cyclist?’ I asked bitterly.
1969		R. Rendell Best Man To Die (1981) 10: It’s your bloody head. Take it along to a trick cyclist if it bothers you.
1977		G.F. Newman A Prisoner’s Tale 133: My old lady took me to all sorts of trickcyclists when I was a kid. We seemed to camp in Harley Street, all top men.
1982		G. Newbold Big Huey 103: Ted [...] was a condition of acute depression [...] so he went to the trickcyclist and got put on medication.
2000		J.J. Connolly Layer Cake 52: She’s been put through her paces by the very top trick-cyclists, child psycho-watsits.
2016		D. Whish-Wilson Old Scores [ebook] ‘Figments of my imagination, they are. That’s what the old trick-cyclist told me’.