Crossword Genius

Old agricultural worker picked up white horses (4)

Ross

I believe the answer is:

surf

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'white horses' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for surf that I've seen before include "Waves breaking on the shore" , "It's created by breaking waves" , "Randomly look at" , "Visit various websites" , "Balance on waves" .)

I've seen this clue in The Daily Mail.
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