Gambler's favourite girl? (5)

I believe the answer is:

kitty

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This could be a double definition.

'gambler's favourite' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'girl?' is the second definition.

Can you help me to learn more?

(Other definitions for kitty that I've seen before include "Pool - puss" , "Tom's mate" , "Pool - Katharina?" , "that 6 ac [CAT BURGLAR] steals?" , "Young domestic pet" .)

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