Japanese peak (4)
I believe the answer is:
fuji
'japanese peak' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for fuji that I've seen before include "Sacred Japanese peak" , "Japan's sacred mountain" , "Japanese holy mountain" , "Highest Jap. mountain" , "Extinct volcano in south central Honshu" .)