A ruddy tasteful Beethoven piece (4)
I believe the answer is:
beet
'a ruddy tasteful beethoven piece' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
This is all the clue.
Can you help me to learn more?
(Other definitions for beet that I've seen before include "Root vegetable producing sugar" , "Sugar-yielding root" , "Plant grown for sugar" , "E.g. chard, mangelwurzel" , "The mangelwurzel, for instance" .)