Answer: fillips

AnswerCrossword Clue
FILLIPSSnaps one's fingers.
fillipsA slight smart stroke or tap given in such a way
fillipsA movement made by bending the last joint of a finger against the thumb and suddenly releasing it; a flick of the finger
fillipsFILLIP, to strike sharply
fillipsSomething that acts as a stimulus or boost to an activity