Show of indifference (5)
I believe the answer is:
shrug
'show of indifference' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for shrug that I've seen before include "Expression of indifference" , "women's wear" , "Dismissive movement of shoulders" , "Expressive shoulder movement" , "Raise (shoulders) slightly" .)