Died in heavenly city that was built by the Phoenicians (5)
I believe the answer is:
sidon
'city that was built by the phoenicians' is the definition.
'sidon' can be an answer for 'city' (I have seen 'Ancient city' mean 'sidon' so perhaps 'city' could also mean 'sidon'). I am not sure about the remainder of the definition.
'died in heavenly' is the wordplay.
'died' becomes 'd' (abbreviation next to the year of someone's death).
'in' means one lot of letters goes inside another.
'heavenly' becomes 'sion' (I can't justify this - if you can you should give a lot more credence to this answer).
'd' inserted within 'sion' is 'SIDON'.
Can you help me to learn more?
(Other definitions for sidon that I've seen before include "Ancient Phoenician city" , "Chief city of ancient Phoenicia" , "It was allied to Tyre in Biblical times" .)