Solo playing can daze when 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.
Maybe they are linked in a way I don't understand?
'can daze when done badly' is the wordplay.
'can daze' can be anagrammed to 'CADENZA'.
Though, I'm not clear how the anagram is indicated.
Can you help me to learn more?
(Other definitions for cadenza that I've seen before include "Virtuoso solo passage near the end of a piece of music" , "Virtuoso musical passage" , "Virtuoso passage in concerto, etc" , "(In music) virtuoso passage - can daze (anag)" , "Virtuoso performance" .)