Playful bit of a tune on the piano (3)
I believe the answer is:
pun
'playful bit' 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?
'a tune on the piano' is the wordplay.
'a tune' becomes 'un' (I can't justify this - if you can you should believe this answer much more).
'on' says to put letters next to each other.
'the piano' becomes 'p' (musical abbreviation).
'un' after 'p' is 'PUN'.
'of' is the link.
Can you help me to learn more?
(Other definitions for pun that I've seen before include "Humorous play on words" , "joke" , "A play on words, not really wit" , "Bit of paronomasia; witticism" , "A play on words, perhaps the lowest form of wit" .)