Crossword Genius

Standing over the pupil, a girl (4)

Ross

I believe the answer is:

nola

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

'girl' is the definition.

'standing over the pupil a' is the wordplay.
I cannot quite see how this works, but
'over' could be 'o' (cricket abbreviation) and 'o' is found within the answer.
'pupil' could be 'l' and 'l' is found within the answer.
'a' is present in the answer.
A single letter 'n' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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