His taste is vegetarian (4)
I believe the answer is:
herb
This clue could be a double definition.
'his taste' is the first definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'vegetarian' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'is' is the link.
Can you help me to learn more?
(Other definitions for herb that I've seen before include "Plant used for flavour" , "Eg, sage" , "Rosemary, for example" , "Savoury plant" , "ingredient for recipe?" .)