Composer died in prison (5)
I believe the answer is:
caged
'in prison' is the definition.
(caged can mean imprisoned)
'composer died' is the wordplay.
'composer' becomes 'cage' (I've seen this before).
'died' becomes 'd' (abbreviation next to the year of someone's death).
'cage'+'d'='CAGED'
(Other definitions for caged that I've seen before include "Shut up" , "Confined behind bars" , "in prison" , "In a zoo?" , "Cooped up" .)