Crossword Genius

Approve of sellers, not very European (7)

Ross

I believe the answer is:

endorse

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'approve of' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

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(Other definitions for endorse that I've seen before include "Docket" , "Support (with signature)" , "Red ones (anag.)" , "Champion" , "Give backing to" .)

I've seen this clue in The Times.
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