Plant producing beans (4)
I believe the answer is:
soya
'plant producing beans' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for soya that I've seen before include "I'm rich in oil" , "Asian bean yielding edible oil and flour" , "Legume" , "Crop with nutritious oil-rich seeds" , "Bean protein" .)