A season with Bury (6)
I believe the answer is:
'a season' is the definition.
(winter is a kind of season)
'with bury' is the wordplay.
'with' becomes 'w' (abbreviation).
'bury' becomes 'inter' (I've seen this before).
(Other definitions for winter that I've seen before include "'If . . . . . . comes, can spring be far behind?'" , "Time for mittens and scarves?" , "Cold period" , "'Now is the . . . . . . of our discontent' (Richard III)" , "period of discontent?" .)