Rap-grind-core CD (9)
I believe the answer is:
recording
'cd' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'rap-grind-core' is the wordplay.
'grind-core' anagrams to 'RECORDING'.
Though, I'm not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for recording that I've seen before include "Taping" , "Eg, something on CD" , "Transcription" , "Writing down or registering electronically" , "Tape" .)