Mr Duck died a dissolute man (5)
I believe the answer is:
drake
'mr duck' is the definition.
'drake' can be an answer for 'duck' (drake is a kind of duck). I am unsure of the 'mr' bit.
'died a dissolute man' is the wordplay.
'died' becomes 'd' (abbreviation next to the year of someone's death).
'a dissolute man' becomes 'rake' (I've seen this before).
'd'+'rake'='DRAKE'
Can you help me to learn more?
(Other definitions for drake that I've seen before include "world traveller" , "Hoe user" , "Elizabethan sailor" , "First English captain to sail round the world" , "might be after a duck?" .)