God has Egyptian seaport to set up (4)
I believe the answer is:
zeus
'god' is the definition.
(I've seen this before)
'egyptian seaport to set up' is the wordplay.
'egyptian seaport' becomes 'suez' (I've seen this before).
'to set up' says the letters should be written backwards.
'suez' backwards is 'ZEUS'.
'has' is the link.
(Other definitions for zeus that I've seen before include "Head of the Greek gods" , "Supreme god of Greek myth" , "Celestial ruler" , "Greek god of gods" , "Great being in Greece" .)