Opera company puts on 'A Caribbean Rising' (7)
I believe the answer is:
nabucco
'opera' is the definition.
(I know that Nabucco is a opera)
'company puts on a caribbean rising' is the wordplay.
'company' becomes 'co' (abbreviation).
'puts on' means one lot of letters go next to another.
'a caribbean' becomes 'cuban' (I've seen this before).
'rising' says the letters should be written in reverse (going up in a down clue).
'cuban' written backwards gives 'nabuc'.
'co' put after 'nabuc' is 'NABUCCO'.
(Other definitions for nabucco that I've seen before include "Verdi Biblical opera" , "Italian opera" , "Verdi opera; con Cuba (anag.)" .)