Green’s Dictionary of Slang

stand-in n.

(US) a friendly or profitable arrangement; a corrupt arrangement, a ‘put-up job’.

Food Journal 1 Nov. 523: The affair is settled amicably by a ‘stand in,’ which means that the purchaser shall pay the other, or others, a certain sum not to bid against him [DA].
[US]J.W. Carr ‘Words from Northwest Arkansas’ in DN III:iii 158: stand-in, n. Favor, influence. ‘You want to get a stand-in with him.’.
[US]R. Lardner ‘My Roomy’ in Coll. Short Stories (1941) 341: They was goin’ to fire the club out; but Charlie had a good stand-in with Amos, the proprietor, and he fixed it up to let us stay.
[US]T. Boyd Through the Wheat 16: You sure have got a stand-in with Bedford.
[US]J. Black You Can’t Win (2000) 44: The whole thing was a stand-in from the captain down.
[US]Helfand Report 54: The subject of ‘stand-in’ arrests (wherein Police Officers for a monetary consideration refrain from arresting a bookmaker and by mutual consent arrest some person innocent of the crime but willing to act as a substitute) has been a matter of intense interest to the Grand Jury.
[US]R. Daley Target Blue 389: It claimed that six persons were paid $100 each to take ‘stand-in’ or ‘accommodation’ arrests.