Share mittens, holding authority (5)
I believe the answer is:
remit
'authority' is the definition.
(I've seen this before)
'share mittens holding' is the wordplay.
'holding' says the answer is hidden in the clue.
'REMIT' is hidden in the letters of 'share mittens'.
(Other definitions for remit that I've seen before include "Send; brief" , "Send - scope of one's duties" , "instructions required" , "Send (money) by post" , "Job specification" .)