Not yet getting on with my interlocutor, nattering emptily (5)
I believe the answer is:
young
'not yet getting on' is the definition.
(getting on can mean getting older)
'with my interlocutor nattering emptily' is the wordplay.
'with' says to put letters next to each other.
'my interlocutor' becomes 'you' (the crossword setter is talking to you the solver).
'emptily' says to hollow out the word (remove centre letters) (the word is emptied of its middle letters).
'nattering' with its centre removed is 'ng'.
'you' next to 'ng' is 'YOUNG'.
(Other definitions for young that I've seen before include "interviewer of PMs on the radio" , "Mormon leader" , "like Lochinvar?" , "Of tender years" , "In early life" .)