Dress down in a pile on the floor? (6)

I believe the answer is:

carpet

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

I don't understand the remainder of the clue.

(Other definitions for carpet that I've seen before include "Floor-covering" , "Tell off" , "Reprimand, reprove" , "Be on this floor covering to be reprimanded" , "has pull up sharply" .)

I've seen this clue in The Independent.

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