He's in town tonight (4)

I believe the answer is:

toni

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'he's' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'town tonight' is the wordplay.
'town' becomes 't' (common abbreviation eg in football team names).
'tonight' becomes 'oni' (I can't explain this - if you can you should give a lot more credence to this answer).
't'+'oni'='TONI'

'in' is the link.

Can you help me to learn more?

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

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