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Quaint northern child growing up fast? (5)

Ross

I believe the answer is:

tween

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'child growing up fast?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'quaint northern' is the wordplay.
'quaint' becomes 'twee' (both can mean sentimental or old-fashioned).
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'twee'+'n'='TWEEN'

Can you help me to learn more?

(Another definition for tween that I've seen is " In middle of abridged".)

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