Defrost (4)
I believe the answer is:
thaw
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">defrost</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that defrost is a more specific form of thaw)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for thaw that I've seen before include "Player of detective" , "spring weather?" , "Frost going" , "end of the winter?" , "Begin to melt" .)