Crossword Genius

Fell for bargain (5-4)

Ross

I believe the answer is:

knock down

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

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

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(Other definitions for knock down that I've seen before include "Fell - to this bargain price?" , "Cheap - floor" , "Declare (lot) sold" , "aim of Haye, say" , "very low in price" .)

I've seen this clue in The Telegraph.
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