Wholemeal is not alive in slang (5,5)
I believe the answer is:
brown bread
'slang' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for brown bread that I've seen before include "Rye, for one" , "Food item made with unbleached flour" , "Granary foodstuff" .)