Gory bits maybe supplied by Gore (5)
I believe the answer is:
offal
'gore' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for offal that I've seen before include "Less edible parts of animal, entrails and organs" , "Entails and organs of animals, rubbish" , "Edible animal viscera" , "Waste of carcase" , "Entrails/organs as food" .)