Crossword Genius

Wild garlic chokes posh traveller but not ordinary farmer (13)

Ross

I believe the answer is:

agriculturist

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

'farmer' is the definition.
(agriculturist is a kind of farmer)

'wild garlic chokes posh traveller but not ordinary' is the wordplay.
I cannot quite see how this works, but
'posh' could be 'u' (abbreviation for upper-class - opposite to non-U) and 'u' is found within the answer.
an anagram of 'garlic' is 'agricl' which is within the left over letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for agriculturist that I've seen before include "Farming expert" , "E.g. a farmer" .)

I've seen this clue in The Guardian.
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