Put down by a puzzler? (7)

I believe the answer is:

floored

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'put down' is the definition.
'floored' can be an answer for 'down' (thesaurus). I am not certain of the 'put' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for floored that I've seen before include "Knocked out" , "Threw" , "stumped" , "Completely baffled" , "Completely confounded" .)

I've seen this clue in the Evening Standard.

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