Nearly genius track from aspiring band (4)
I believe the answer is:
demo
'track from aspiring band' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'nearly genius' is the wordplay.
'nearly' means to remove the last letter.
'genius' becomes 'demon' (I've seen this before).
'demon' with its final letter taken off is 'DEMO'.
Can you help me to learn more?
(Other definitions for demo that I've seen before include "Eg, protest march" , "presentation" , "illustration" , "Political protest" , "March (abbr)" .)