Crossword Genius

Having to be paid for, though somewhere else (3,7)

Ross

I believe the answer is:

not present

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

'paid for though somewhere else' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'having to be' is the wordplay.
I cannot really understand how this works, but
'be' could be 'present' (presenting is a kind of being) and 'present' is present in the answer.
The remaining letters 'not' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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