Crossword Genius

Something one's been billed for that's missing (3,7)

Ross

I believe the answer is:

not present

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

'missing' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app