Squabble, bicker (5)
I believe the answer is:
argue
I believe this is a double definition.
'squabble' is the first definition.
(I've seen this in another clue)
'bicker' is the second definition.
(I've seen this before)
(Other definitions for argue that I've seen before include "Quarrel or disagree" , "Squabble" , "Dispute, express angry words" , "Have a difference of opinion" , "Wrangle" .)