Less cold (6)
I believe the answer is:
warmer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">less cold</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for warmer that I've seen before include "Closer to target" , "Containing more heat" , "Having a higher temperature" , "Less cold" , "Less cool" .)