Composer’s heart in poor condition after relapse (7)
I believe the answer is:
corelli
'composer's' is the definition.
(Arcangelo Corelli)
'heart in poor condition after relapse' is the wordplay.
I cannot really understand how this works, but
'heart' could be 'core' (synonyms) and 'core' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for corelli that I've seen before include "Arcangelo, seventeenth to eighteenth century Italian composer, violinist" , "Marie - - , romantic 17" , "Captain -'s Mandolin (de Bernires)" , "Arcangelo --, Italian baroque composer" , "A mandolin-playing Captain" .)