Back off (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">back off</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for relent that I've seen before include "Give in to influence or pressure" , "Be less strict" , "Relax severity or opposition" , "Become less severe, soften" , "Decide to be kind after all?" .)
(Other definitions for retreat that I've seen before include "Monastery - bugle call" , "Leave - refuge" , "hermitage, perhaps" , "Tree rat (anag)" , "concession" .)
(Another definition for letup that I've seen is " relief".)