Green’s Dictionary of Slang

pen and inker n.

[rhy. sl. = stinker n.1 (1)]

a suspicious person, esp. a possible informer.

1972
19801990
1992
[UK]Dodson & Saczek Dict. of Cockney Rhy. Sl. 35: pen and inker. Stinker, a person who gives offence.
[UK]R. Puxley Cockney Rabbit.