Shoulder gestures, to show indifference perhaps (6)
I believe the answer is:
shrugs
(Other definitions for shrugs that I've seen before include "Shoulder movements" , "'Shoulder gestures, to show indifference perhaps (6)'" , "Raises shoulders as gesture of indifference or doubt" , "Moves shoulders in gesture of indifference" , "Moves shoulders up and down, being indifferent" .)