A dietary constituent to prohibit outright? (4)
I believe the answer is:
bran
'a dietary' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe you can see a link between them that I can't see?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for bran that I've seen before include "Horse food stored in barn" , "Husks of grain sifted from the flour" , "Fibre cereal" , "Type of edible fibre" , "Refuse from grain" .)