Suit-bringer drops plain disagreement (4)
I believe the answer is:
tiff
'disagreement' is the definition.
(I know that tiff is a type of dustup)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for tiff that I've seen before include "Petty argument" , "A spat or small row" , "Row; argument" , "(Lovers') quarrel" , "Petty squabble" .)