Carping (8)
I believe the answer is:
captious
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">carping</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for captious that I've seen before include "Raising petty objections" , "Fault-finding" , "Carping" , "Tending to find fault" , "Inclined to find fault" .)