1) Antidrug officers 2) British informers 3) British stoolies 4) British slang for the police 5) Complains like informants 6) Drug agents 7) Slough stoolies 8) Stilton stoolies 9) Stool pigeons, London style 10) They sing to the bobbies Found on https://www.crosswordclues.com/clue/narks