Love rice wine, mostly followed by a Japanese port (5)
I believe the answer is:
osaka
'japanese port' is the definition.
(I've seen this before)
'love rice wine mostly followed by a' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'rice wine' becomes 'saki' (I've seen this in another clue).
'mostly' means to remove the last letter (most but not all of the word).
'followed by' means one lot of letters go next to another.
'saki' with its last letter taken off is 'sak'.
'o'+'sak'+'a'='OSAKA'
(Other definitions for osaka that I've seen before include "Large city and port in Japan" , "Place" , "Port city on Honshu, Japan" , "Third largest city in Japan" , "Far East city" .)