Char or blacken (5)
I believe the answer is:
singe
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">char</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that singe is a type of char)</span><br/ ><br/ >'<span class="explanation-format__original">blacken</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that singe is a type of blacken)</span><br/ ><br/ ></span>
(Other definitions for singe that I've seen before include "Scorch lightly" , "Burn superficially" , "Effect of fire" , "Result of match accident" , "Superficial burn" .)