Songs laid out in musical direction (9)
I believe the answer is:
glissando
'musical direction' 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?
'songs laid out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'songs'+'laid'='songslaid'
'songslaid' is an anagram of 'GLISSANDO'.
'in' is the link.
Can you help me to learn more?
(Other definitions for glissando that I've seen before include "Sliding series of notes (mus.)" , "Sliding effect in moving from one musical note to another" , "Musical flourish" , "trombone slide, for example" , "Effect produced by playing a series of notes very rapidly" .)