Tennis champ Naomi (5)
I believe the answer is:
osaka
'tennis champ naomi' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for osaka that I've seen before include "Port city of southern Honshu" , "Large city and port in Japan" , "Place" , "Japanese port, on Honshu" , "Major port and commercial and industrial centre on Honshu" .)