Crossword Genius

Mails bills without hesitation (5)

Ross

I believe the answer is:

posts

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'mails' is the definition.
('post' can be a synonym of 'mail')

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

Can you help me to learn more?

(Other definitions for posts that I've seen before include "Jobs and poles" , "Is dispatching" , "Stakes" , "Sends by mail" , "Mails the uprights?" .)

I've seen this clue in the Sydney Morning Herald.
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