Overlook, forgive (6)
I believe the answer is:
excuse
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">overlook</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">forgive</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(excusing is a kind of forgiving)</span><br/ ><br/ ></span>
(Other definitions for excuse that I've seen before include "Make apologies for" , "Release (from a duty)" , "Pardon, or release from obligation" , "Defense of offensive behavior" , "Condone or forgive" .)