Pardon, overlook (6)
I believe the answer is:
excuse
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">pardon</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">overlook</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for excuse that I've seen before include "Allow to be released from a duty" , "Free - apology" , "Defence of offensive behaviour" , "Pardon or justify" , "Release (from a duty)" .)