Boat to travel north: see the sights of city (7)
I believe the answer is:
gondola
'boat' is the definition.
(I know that gondola is a type of boat)
'travel north see the sights of city' is the wordplay.
'travel' becomes 'go' (synonyms).
'north' becomes 'N' (abbreviation).
'see the sights of city' becomes 'dola' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'go'+'n'+'dola'='GONDOLA'
'to' is the link.
Can you help me to learn more?
(Other definitions for gondola that I've seen before include "Compartment suspended from an airship" , "Venetian boat - airship car" , "Boat on Venetian canals" , "Supermarket display unit" , "It's traditionally used on the canals of Venice" .)