It may be served in a bed (4)
I believe the answer is:
'it may be served in a bed' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rice that I've seen before include "Cultivated food grass" , "Type of grain" , "Curry side dish" , "Grain from the paddy field" , "Paddy field crop" .)