Olympian from Egyptian port returned (4)
I believe the answer is:
zeus
'olympian' is the definition.
(Greek god who lived on Mount Olympus)
'egyptian port returned' is the wordplay.
'egyptian port' becomes 'suez' (I've seen this in another clue).
'returned' shows that the letters should be reversed in order.
'suez' reversed gives 'ZEUS'.
'from' acts as a link.
(Other definitions for zeus that I've seen before include "Greatest ancient Greek god" , "Supreme god of the ancient Greeks" , "Divine son of Cronos and Rhea" , "Chief Olympian deity" , "Chief Olympian god" .)