Main wine of Marseilles, for example (7)
I believe the answer is:
seaport
'marseilles for example' is the definition.
I can't tell whether this definition defines the answer.
'main wine' is the wordplay.
'main' becomes 'sea' (the main is an old name for the sea).
'wine' becomes 'port' (port is a kind of wine).
'sea'+'port'='SEAPORT'
'of' is the link.
Can you help me to learn more?
(Other definitions for seaport that I've seen before include "Coastal town with harbour" , "Town with a large harbour" , "Place with harbour for ocean-going ships" , "Embarkation and disembarkation point for ocean-going ships" , "Dover, say" .)