Disagreements often plain in legal actions (5)

I believe the answer is:

tiffs

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'disagreements' is the definition.
(I know this)

I cannot understand how the remainder of the clue works.

(Other definitions for tiffs that I've seen before include "Small quarrels" , "Spats" , "Huffs; squabbles" , "Arguments" , "Petty quarrels" .)

I've seen this clue in the Evening Standard.

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