At Le Moulin Rouge, a monsieur requests reveals (7)
I believe the answer is:
unmasks
'reveals' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(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" .)