Said, perhaps, to be pronounced “side” (4)
I believe the answer is:
port
'side' is the definition.
(port is a kind of side)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for port that I've seen before include "Isle in Dorset" , "Grimsby, perhaps" , "Wine left at sea ?" , "Rotterdam, e.g." , "Harbour; drink; opening" .)