Finding fault (7)
I believe the answer is:
carping
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">finding fault</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for carping that I've seen before include "Raising trivial objections" , "Complaining" , "Faultfinding" , "Finding fault" , "Censorious" .)