1) Be an informer, slang 2) Betrayer 3) Blabber 4) Blabbermouth 5) Canary 6) Finally plays in long grass 7) Fink 8) Gossip 9) Grass 10) Informant 11) Informer 12) Jailhouse fink 13) Pinch the nose 14) Secret spiller 15) Slang for to tell on somebody 16) Slang for an informer 17) Slang for the nose 18) Sneak Found on https://www.crosswordclues.com/clue/snitch