Slight quarrel (4)
I believe the answer is:
spat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slight quarrel</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 spat that I've seen before include "Ejected saliva from the mouth" , "Unimportant quarrel between Pats" , "Trivial quarrel" , "Petty quarrel - gaiter" , "Spoke violently" .)