Green’s Dictionary of Slang

1. corrupt [= bent adj. (3)].

1998		I. Welsh Filth 277: Essentially harmless even if as Clark Kent as fuck.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.

2. homosexual [= bent adj. (6)].

2003

B. Dark Dirty Cockney Rhy. Sl. 39: She’s fancied him for years, but everyone knows she’s onto a hiding; he’s completely Clark Kent.