He isn't still having a holiday! (6)

I believe the answer is:

busman

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

'he isn't still having a holiday' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'he' is the wordplay.
I cannot really understand how this works, but
'he' could be 'man' (I've seen this in another clue) and 'man' is found in the answer.
The remaining letters 'bus' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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