Chancy girl? (5)

I believe the answer is:

betty

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

'chancy girl?' is the definition.
'Betty' can be an answer for 'girl?'. I'm not certain of the 'chancy' bit.

'girl?' is the wordplay.
I cannot quite see how this works, but
'girl?' could be 'etty' and 'etty' is located in the answer.
A single letter 'b' remains which might be clued in a way I don't see.
This may be the basis of the 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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