Ginger's forename? (3)

I believe the answer is:

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'ginger's forename?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

This is all the clue.

Can you help me to learn more?

(Other definitions for tom that I've seen before include "- Lehrer, US humorist" , "famous schoolboy" , "Very small person" , "Boy - cat" , "Bell" .)

I've seen this clue in the Evening Standard.

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