Hard to lose opening argument (4)

I believe the answer is:

tiff

'hard to lose opening argument' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for tiff that I've seen before include "(Lovers') quarrel" , "pet" , "Quarrel (colloq.)" , "dispute" , "A petty quarrel or difference" .)

I've seen this clue in The Telegraph, The Sun and The Sunday Times.

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