Temporary during winter impact (7)
I believe the answer is:
interim
'temporary' is the definition.
(similar in meaning)
'during winter impact' is the wordplay.
'during' indicates the answer is hidden within the clue.
'INTERIM' can be found hidden inside 'winter impact'.
(Other definitions for interim that I've seen before include "Meantime - provisional" , "Temporary - provisional" , ", I'm put in grave situation initially" , "Meantime; temporary" , "An intervening period of time" .)