Unhappy about one Egyptian port (4)
I believe the answer is:
said
'egyptian port' is the definition.
(I've seen this in another clue)
'unhappy about one' is the wordplay.
'unhappy' becomes 'sad' (associated in meaning).
'about' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'sad' going around 'i' is 'SAID'.
(Other definitions for said that I've seen before include "Expressed orally" , "Stated" , "Aforementioned" , "Spoke" , "Mentioned" .)