Green’s Dictionary of Slang

capture n.

(UK Und.) an arrest and conviction for a crime; thus by extension the person arrested.

[Aus]Sun. Times (Perth) 1 Mar. 1/1: Copper White Wings should muzzle the Bayswater Ferret when capturing duck-shooters [...] C.C-W- has no chance of a capture while the Ferret has teeth.
[Aus]Sport (Adelaide) 13 Dec. 10/2: [used of finding a partner] Annie E. was over at Smith’s ball looking for a capture.
[US]‘A-No. 1’ From Coast to Coast with Jack London 63: They were the latest captures gathered in hoboland. They were marching two abreast securely shackled with hand-cuffs to a chain.
[UK]V. Davis Phenomena in Crime 189: Another important capture made by the Yard.

In phrases

get a capture (v.)

to be arrested.

[UK]F. Norman Bang To Rights 10: No thief and tearaway shows any emotion just because he has got a capture.
[UK]Smiley Culture ‘Cockney Translation’ 🎵 Say we get nyam while cockney get capture.