Season of snow -- interminable? (6)
I believe the answer is:
winter
'season' is the definition.
(winter is a kind of season)
'of snow interminable?' is the wordplay.
'of' says the answer is hidden in the clue.
'WINTER' is hidden in the letters of 'snow interminable'.
(Other definitions for winter that I've seen before include "'Now is the . . . . . . of our discontent' (Richard III)" , "period of discontent?" , "Cold season" , "'If . . . . . . comes, can spring be far behind?'" , "Cold period" .)