Answer: ratting

AnswerCrossword Clue
RATTINGBeing a snitch
RATTINGSnitch's activity
RATTINGSelling out
rattinginform on turn in usually used with out ratted out his accomplice
rattingrat-hunting
rattingcatch or hunt rats
rattinggive (hair) the effect of greater quantity (as by use of a rat)
rattingto betray, desert, or inform on one's associates usually used with on
rattingwork as a scab