In the centre, zlotys were sufficient for a port (7)
I believe the answer is:
otranto
'a port' is the definition.
(Italian port)
'in the centre zlotys were sufficient for' is the wordplay.
'in the centre' indicates the central letters.
'were sufficient for' becomes 'ran to' ('run to' can mean to be enough or suffice).
The middle of 'zlotys' is 'ot'.
'ot'+'ranto'='OTRANTO'
(Other definitions for otranto that I've seen before include "Italian port" , "Italian city" , "Mediterranean port/strait" , "old Roman port" , "The Castle of -- (Walpole); Apulian town" .)