Crossword Genius

The PM's post (5)

Ross

I believe the answer is:

after

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'post' is the definition.
(the prefix 'post-' means 'after')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for after that I've seen before include "Behind; in quest of" , "Looking for" , "At a later time or behind" , "Post, later than" , "Subsequent to" .)

I've seen this clue in the Evening Standard.
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