Mean to a girl (5)

I believe the answer is:

norma

'girl' is the definition.

'mean to a' is the wordplay.
'mean' becomes 'norm' (I've seen this before).
'norm'+'a'='NORMA'

(Other definitions for norma that I've seen before include "Bellini opera - girl's name" , "Eponymous woman of opera" , "Roman (anag) - girl's name" , "Game; shared supply" , "Outdoor function" .)

I've seen this clue in the Evening Standard.

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