Is in the record as an imperfect utterance (4)
I believe the answer is:
lisp
'an imperfect utterance' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?
'is in the record' is the wordplay.
'in' is an insertion indicator.
'the record' becomes 'LP' (abbreviation for long play record).
'is' going inside 'lp' is 'LISP'.
'as' acts as a link.
Can you help me to learn more?
(Other definitions for lisp that I've seen before include "speak imperfectly" , "Talk like thith" , "Non-standard pronunciation" , "Be unable to pronounce S" , "Speak with defective sibilants" .)