It occupies amount of usual vegetarian fare (4)
I believe the answer is:
tofu
'fare' is the definition.
(tofu is a kind of food)
'it occupies amount of usual vegetarian' is the wordplay.
'TOFU' is hidden within the letters.
But, I am uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for tofu that I've seen before include "Cheese-like vegetarian food" , "Soya bean product used in Asian and vegetarian cookery" , "food rich in protein" , "'Soft white food, made of soy milk (4)'" , "Form of curd" .)