Unwinds (7)
I believe the answer is:
relaxes
'unwinds' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for relaxes that I've seen before include "Makes less tense" , "Hangs loose" , "Moderates" , "'Rests, takes a break (7)'" , "Slackens" .)