Petty quarrel isn't quite severe (4)

I believe the answer is:

tiff

I'm a little stuck... Click here to teach me more about this clue!

'petty quarrel' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for tiff that I've seen before include "A minor quarrel of disagreement" , "causing quarrel" , "(Lovers') quarrel" , "Lovers' row" , "A spat or small row" .)

I've seen this clue in The Irish News.

Want a hint initially instead of a full solution? Install my app