Mushroom with a long, thin stem (5)
I believe the answer is:
enoki
'mushroom with a long thin stem' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for enoki that I've seen before include "Fare from the Far East" , "Japanese food" , "Japanese mushroom type" , "Oriental mushroom; E ikon (anag.)" .)