One wears blue in Egyptian port (4)
I believe the answer is:
said
'egyptian port' is the definition.
(I've seen this in another clue)
'one wears blue' is the wordplay.
'one' becomes 'i' (Roman numeral).
'wears' means one lot of letters goes inside another.
'blue' becomes 'sad' (similar in meaning).
'i' inserted into 'sad' is 'SAID'.
'in' acts as a link.
(Other definitions for said that I've seen before include "Rumoured" , "Mentioned" , "Uttered at Suez port" , "Port ____, important site in the Suez crisis" , "Stated" .)