Green’s Dictionary of Slang

fit-up n.2

[fit up v.1 (2)]

(UK Und.) a false accusation or perjured evidence used to have an innocent suspect (albeit one who has a criminal record) arrested and found guilty.

[UK]G.F. Newman Sir, You Bastard 71: [Barristers] rarely brooked any suggestion of police brutality or fit-ups.
[UK] in G. Tremlett Little Legs 121: Chopper takes £500 round for her and it was a fit-up.
[Scot]I. Welsh Filth 59: This is a fuckin disciplinary fit-up.
[Scot]A. Parks Bobby March Will Live Forever 16: ‘He was like the rest of that shop. Backhanders, fit-ups and the path of least resistance’.