Part of winter valued for a break (8)
I believe the answer is:
interval
'a break' is the definition.
(I've seen this before)
'part of winter valued for' is the wordplay.
'part of' says the answer is hidden in the clue.
'INTERVAL' can be found hidden inside 'winter valued for'.
(Other definitions for interval that I've seen before include "Travel in (anag.)" , "what's between notes?" , "Space of time" , "Hiatus" , "Pause in middle of performance" .)