Crossword Genius

They send out the bills (7)

Ross

I believe the answer is:

posters

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

'bills' is the definition.
('poster' can be a synonym of 'bill')

'they send out' is the wordplay.
I cannot quite see how this works, but
'send' could be 'post' (to send in the post) and 'post' is found in the answer.
The remaining letters 'ers' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'the' acts as a link.

Can you help me to learn more?

(Other definitions for posters that I've seen before include "Placards, notices" , "Bills or placards on walls" , "Public placards" , "Contributors to forum" .)

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