Left on board we hear in an Egyptian harbour (4,4)
I believe the answer is:
port said
'an egyptian harbour' is the definition.
The definition suggests a singular noun which matches the answer.
'left on board we hear' is the wordplay.
'left on board' becomes 'port' (port is left on board a ship).
'we hear' becomes 'said' (I can't justify this - if you can you should give a lot more credence to this answer).
'port'+'said'='PORT SAID'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for port said that I've seen before include "Place" , "Mediterranean city" , "Egyptian city" .)