Easing of tensions
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">easing of tensions</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 thaw that I've seen before include "What - melt like snow?" , "Become liquid" , "Become less stiff, more relaxed" , "(Of snow) start to melt" , "Begin to melt" .)