Crossword Genius

This little girl needs only a moment to finish (3)

Ross

I believe the answer is:

bea

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

'this little girl' is the definition.
'Bea' can be an answer for 'girl'. I am unsure of the 'this little' bit.

'only a moment to finish' is the wordplay.
I cannot quite see how this works, but
'a' is present in the answer.
The remaining letters 'be' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'needs' is the link.

Can you help me to learn more?

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