Wind or unsettled weather (7)
I believe the answer is:
wreathe
'wind' is the definition.
(synonyms)
'unsettled weather' is the wordplay.
'unsettled' indicates an anagram.
'weather' is an anagram of 'WREATHE'.
'or' is the link.
(Other definitions for wreathe that I've seen before include "Twist together" , "(E.g smoke) curl" , "Weather (anag.)" , "Encircle with flowers" , "Surround, encircle" .)