Girl not entirely conventional (5)

I believe the answer is:

norma

'girl' is the definition.

'not entirely conventional' is the wordplay.
'not entirely' means to remove the last letter (not all of the word).
'conventional' becomes 'normal' (I've seen this in another clue).
'normal' with its last letter taken off is 'NORMA'.

(Other definitions for norma that I've seen before include "Opera - ex-PM's wife" , "Roman (anag) - girl's name" , "- - Jean Baker: Marilyn Monroe" , "John Major's wife - Bellini opera" , "Bellini's heroine" .)

I've seen this clue in The Sun.

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