The French flag in "Les Miserables," for one (4)

I believe the answer is:

prop

(Other definitions for prop that I've seen before include "A rigid supprot or piece of satge furniture (4)" , "Object used on the set of a play" , "Stay" , "Set piece" , "A rigid support - 37 Across is one" .)

I've seen this clue in the Universal.

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