Journey round large island city (7)
I believe the answer is:
tripoli
'city' is the definition.
(Tripoli is an example)
'journey round large island' is the wordplay.
'journey' becomes 'trip' (trip is a kind of journey).
'round' becomes 'o' (round can mean a round object).
'large' becomes 'L' (eg in clothes sizes).
'island' becomes 'i' (geographical abbreviation).
'trip'+'o'+'l'+'i'='TRIPOLI'
(Other definitions for tripoli that I've seen before include "city on the Mediterranean" , "Polish" , "Place in Libya" , "Libyan port" , "Lebanese port" .)