Coldest season (6)
I believe the answer is:
winter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">coldest season</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for winter that I've seen before include "'If . . . . . . comes, can spring be far behind?'" , "period of freeze?" , "Cold season" , "Cold period" , "'Now is the . . . . . . of our discontent' (Richard III)" .)