Duke meeting greedy king (5)
I believe the answer is:
david
'king' is the definition.
(I have seen 'Hebrew king' mean 'david' so perhaps 'king' could also mean 'david')
'duke meeting greedy' is the wordplay.
'duke' becomes 'd' (abbreviation).
'meeting' is a charade indicator (letters next to each other).
'greedy' becomes 'avid' (synonyms).
'd'+'avid'='DAVID'
(Other definitions for david that I've seen before include "Dickens hero" , "The Psalmist" , "King of Judah and Israel, Saul's successor" , "Goliath's slayer" , "Hebrew king" .)