Squabble, bicker (5)
I believe the answer is:
argue
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">squabble</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">bicker</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for argue that I've seen before include "Quarrel or disagree" , "Squabble" , "Dispute, express angry words" , "Have a difference of opinion" , "Wrangle" .)