Annoys girls left inside (5)

I believe the answer is:

galls

'annoys' is the definition.
(I've seen this in another clue)

'girls left inside' is the wordplay.
'girls' becomes 'gals' ('gal' can be a synonym of 'girl').
'left' becomes 'l' (common abbreviation).
'inside' is an insertion indicator.
'gals' enclosing 'l' is 'GALLS'.

I've seen this clue in The Daily Express.

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