One morbidly interested in death, say, remains in a stew (7)
I believe the answer is:
goulash
'stew' is the definition.
(I know that goulash is a stew)
'one morbidly interested in death say remains' is the wordplay.
'one morbidly interested in death' becomes 'ghoul' (ghoul can mean someone interested in death).
'say' indicates a 'sounds like' (homophone) clue.
'remains' becomes 'ash' (remains of a fire).
'ghoul' is a homophone of 'goul'.
'goul'+'ash'='GOULASH'
'in a' acts as a link.
(Other definitions for goulash that I've seen before include "Spicy Hungarian stew" , "Stew flavoured with paprika" , "Stew of meat and veg, seasoned with paprika" , "food" , "Hungarian stew of meat and veg with seasoning" .)