Puzzled to find oneself on the ground beside the horse? (6)

I believe the answer is:

thrown

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'puzzled' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

(Other definitions for thrown that I've seen before include "Disconcerted, confused" , "Confused; chucked" , "Unseated" , "baffled" , "Confused - cast" .)

I've seen this clue in the Evening Standard.

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