Bad son's even seen entertaining King Lear production? (8,5)
I believe the answer is:
nonsense verse
'lear production?' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'bad son's even seen entertaining king' is the wordplay.
'bad' is an anagram indicator.
'entertaining' is an insertion indicator.
'king' becomes 'R' (abbreviation for rex, king in Latin).
'sons'+'even'+'seen'='sonsevenseen'
'sonsevenseen' with letters rearranged gives 'nonsensevese'.
'nonsensevese' enclosing 'r' is 'NONSENSE VERSE'.
Can you help me to learn more?
(Other definitions for nonsense verse that I've seen before include "Edward Lear speciality" , "Trifling ditty by fool" , "Absurd poetry" , "something from Lear" , "Work by Edward Lear?" .)