Crossword Genius

Worry dry wine agent's backers (7)

Ross

I believe the answer is:

perturb

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'worry' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for perturb that I've seen before include "Ruffle the composure (of)" , "Disturb - trouble" , "Worry" , "upset" , "Discountenance" .)

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