Crossword Genius

Prep. with acc., behind or after (4)

Ross

I believe the answer is:

post

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'after' is the definition.
(prefix meaning after, eg post-war)

I cannot understand how the rest of the clue works.

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(Other definitions for post that I've seen before include "ob" , "Stake, job or mail" , "Station" , "Pole - position" , "Spot the mail" .)

I've seen this clue in The Times.
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