Gilbert and Sullivan work about a cursed line of baronets (9)
I believe the answer is:
ruddigore
'gilbert and sullivan' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'work about a cursed line of baronets' is the wordplay.
I cannot really see how this works, but
'work' could be 'dig' (digging is a kind of working) and 'dig' is found within the answer.
'about' could be 're' ('re' means regarding or about) and 're' is found within the answer.
'of' could be 'o' and 'o' is located in the answer.
The remaining letters 'rud' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ruddigore that I've seen before include "G&S operetta" , "G & S' alternative for "The Witch''s Curse"" , "Gilbert and Sullivan opera" , "show" , "One of 63 [OPERETTAS]" .)