Confidence in a team (5)
I believe the answer is:
aside
'confidence' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?
'a team' is the wordplay.
'team' becomes 'side' (both can mean a sports team).
'a'+'side'='ASIDE'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for aside that I've seen before include "remark, incidentally" , "Away from main action" , "Quiet words spoken" , "Actor's line directed solely to audience" , "I.e. sad (anag.)" .)