Delve (3)
I believe the answer is:
dig
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">delve</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for dig that I've seen before include "Jibe" , "Sly remark; excavate" , "critical remark" , "Cutting remark" , "criticism" .)