Gaiter disagreement (4)
I believe the answer is:
spat
This clue is a double definition.
'gaiter' is the first definition.
('spat' can be a synonym of 'gaiter')
'disagreement' is the second definition.
(spat is a kind of disagreement)
(Other definitions for spat that I've seen before include "Slight quarrel - ejected saliva" , "Old leg wear - brief quarrel" , "Gestured with contempt" , "Quarrel about petty point" , "Trivial quarrel" .)