Opera produced by a Scot (5)
I believe the answer is:
tosca
'opera' is the definition.
(Giacomo Puccini opera)
'produced by a scot' is the wordplay.
'produced' indicates an anagram.
'by' says to put letters next to each other.
'a' put after 'scot' is 'scota'.
'scota' with letters rearranged gives 'TOSCA'.
(Other definitions for tosca that I've seen before include "role for diva" , "Luigi -, Italian playwright" , "Puccini's jumper" , "Puccini heroine" , "Opera heroine who leaps to her death" .)