Noncommittal gesture (5)
I believe the answer is:
shrug
'noncommittal gesture' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for shrug that I've seen before include "Raise (shoulders) slightly" , "indifferent response" , "Gesture of indifference or ignorance" , "Brush off" , "women's wear" .)