Crossword Genius

A bookish girl (4)

Ross

I believe the answer is:

nana

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

'girl' is the definition.

'a bookish' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
The remaining letters 'na' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for nana that I've seen before include "Grandmother - dog in Peter Pan" , "Old woman" , "Grandma" , "Informal grandmother" , "Idiot" .)

I've seen this clue in the Evening Standard.
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