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At Le Moulin Rouge, a monsieur requests reveals (7)

Ross

I believe the answer is:

unmasks

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'reveals' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

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(Other definitions for unmasks that I've seen before include "Removes domino" , "Reveals the true nature of" , "Exposes, shows up" , "lays oneself open" , "Exposes, removes disguise" .)

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