Solo playing can daze done badly (7)
I believe the answer is:
cadenza
'solo playing' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'can daze done badly' is the wordplay.
'done badly' indicates an anagram (I've seen this in other clues).
'can'+'daze'='candaze'
'candaze' with letters rearranged gives 'CADENZA'.
Can you help me to learn more?
(Other definitions for cadenza that I've seen before include "Virtuoso performance" , "Impromptu insertion in piece of music" , "Virtuoso solo passage in a concerto" , "Virtuoso passage in concerto, etc" , "Virtuoso solo passage near the end of a piece of music" .)