Crossword Genius

This person's job or duty (6)

Ross

I believe the answer is:

impost

'duty' is the definition.
(impost is a kind of duty)

'this person's job' is the wordplay.
'this person's' becomes 'im' (this person means the crossword setter themselves).
'job' becomes 'post' (post is a kind of job).
'im'+'post'='IMPOST'

'or' is the link.

(Other definitions for impost that I've seen before include "Customs duty" , "A tax or duty levied" .)

I've seen this clue in The Guardian.
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