Rome debut of 1900 (5)

I believe the answer is:

tosca

(Other definitions for tosca that I've seen before include "Photographic device" , "Ascot (anag) - operatic heroine" , "Puccini's Roman heroine" , "Opera - a Scot (anag)" , "Coats off for Pucccni's opera" .)

I've seen this clue in The Wall Street Journal.

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