Soya bean product (4)
I believe the answer is:
tofu
'soya bean product' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tofu that I've seen before include "Soya bean food" , "Substitute for meat" , "Substance used in vegetarian cookery" , "Soy bean curd" , "soybean curd" .)