Crossword Genius

Paperhanger who mails his account? (10)

Ross

I believe the answer is:

billposter

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

'paperhanger who mails his' is the definition.
The definition suggests a singular noun which matches the answer.

'account?' is the wordplay.
I cannot really see how this works, but
'account?' could be 'bill' (billing is a kind of accounting) and 'bill' is found in the answer.
The remaining letters 'poster' 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?

(Other definitions for billposter that I've seen before include "One who pastes up adverts on hoardings" , "One pasting up advertisements" , "One who sticks at his job" .)

I've seen this clue in The Globe and Mail.
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