Disconcerted at being dislodged from the saddle (6)

I believe the answer is:

thrown

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

I can't explain the remainder of the clue.

(Other definitions for thrown that I've seen before include "given up intentionally" , "Disconcerted, confused" , "Having been projected through the air" , "Rabindranath ---, Indian sage" , "Disconcerted; chucked" .)

I've seen this clue in the Evening Standard.

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