Crossword Genius

Authoritarian post office upset by journalists with extreme odour (9)

Ross

I believe the answer is:

oppressor

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

'authoritarian' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'post office upset by journalists with extreme odour' is the wordplay.
'post office' becomes 'po' (abbreviation).
'upset' is a reversal indicator.
'by journalists' becomes 'press' (the press can mean the newspaper industry. I am not sure about the 'by' bit.).
'with' is a charade indicator (letters next to each other).
'extreme' means to remove the middle letters.
'odour' with its centre removed is 'or'.
'po' in reverse letter order is 'op'.
'op'+'press'+'or'='OPPRESSOR'

Can you help me to learn more?

(Other definitions for oppressor that I've seen before include "Tyrant" , "Persecutor of proposers" , "Despot" , "Proposers for one who persecutes" , "One who keeps another in subjection" .)

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