Mushroom used in kitchen Okinawa-style (5)
I believe the answer is:
enoki
'mushroom' is the definition.
(I've seen this before)
'in kitchen okinawa-style' is the wordplay.
'in' indicates a hidden word.
'ENOKI' is hidden in the letters of 'kitchen okinawa style'.
'used' is the link.
(Other definitions for enoki that I've seen before include "Japanese food" , "Fare from the Far East" , "Japanese mushroom type" , "Oriental mushroom; E ikon (anag.)" .)