Opera by Puccini (5)
I believe the answer is:
tosca
'opera by puccini' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tosca that I've seen before include "musical work" , "role for diva" , "Opera - a Scot (anag)" , "Coats off for Puccini's opera" , "Puccini's Rome opera" .)