Upsetting part for Pavarotti, Domingo likewise (5)
I believe the answer is:
ditto
'likewise' is the definition.
(I've seen this before)
'upsetting part for pavarotti domingo' is the wordplay.
'upsetting' says the letters should be written backwards.
'part' indicates the answer is hidden within the clue.
'ottid' is hidden in the letters of 'for pavarotti domingo'.
'ottid' reversed gives 'DITTO'.
(Other definitions for ditto that I've seen before include "Do alternative" , "Dot it for the same again" , "Duplicate" , "couple of marks" , "As per previous" .)