Reddens (7)
I believe the answer is:
blushes
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reddens</span>' is the definition.<br/ ><span class="explanation-format__explanation">('blush' can be a synonym of 'redden')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for blushes that I've seen before include "Turns red with embarrassment" , "Reddenings of the face, in embarrassment perhaps" .)