It brought back very loud disagreement (4)

I believe the answer is:

tiff

'disagreement' is the definition.
(I know that tiff is a type of dustup)

'it brought back very loud' is the wordplay.
'brought back' says the letters should be written in reverse.
'very loud' becomes 'ff' (musical abbreviation).
'it' written backwards gives 'ti'.
'ti'+'ff'='TIFF'

(Other definitions for tiff that I've seen before include "Row; argument" , "A minor quarrel of disagreement" , "Mild quarrel" , "Quarrel (colloq.)" , "Minor argument" .)

I've seen this clue in The Everyman puzzle in The Observer.

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