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Might she win 1,000 Guineas? (5)

Ross

I believe the answer is:

filly

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

This might be a double definition.

'might she' is the first definition.
The definition suggests a singular noun which matches the answer.

'win 1000 guineas?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

Can you help me to learn more?

(Other definitions for filly that I've seen before include "Young female horse" , "Female horse under four years old" , "Young mare" .)

I've seen this clue in the Evening Standard.
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