It detoxifies your top dress (6)

I believe the answer is:

livery

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'dress' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

(Other definitions for livery that I've seen before include "Uniform - commercial care of horses" , "The care of horses for pay" , "Irritable" , "old servants" , "The stabling and care of horses" .)

I've seen this clue in The Irish Times.

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