He's in town tonight (4)

I believe the answer is:

toni

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'he's' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'town tonight' is the wordplay.
'town' becomes 't' (abbreviation for town).
'tonight' becomes 'oni' (I can't justify this - if you can you should give a lot more credence to this answer).
't'+'oni'='TONI'

'in' acts as a link.

Can you help me to learn more?

(Another definition for toni that I've seen is " Girl".)

I've seen this clue in the Evening Standard.

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