Listened in with appreciation, then reprimanded (9)
I believe the answer is:
earwigged
'listened in' is the definition.
'appreciation then reprimanded' is the wordplay.
'appreciation' becomes 'ear' (eg an 'ear for music' - ability to appreciate it).
'then' says to put letters next to each other.
'reprimanded' becomes 'wigged' (wig can informally mean to criticise or rebuke).
'ear'+'wigged'='EARWIGGED'
'with' acts as a link.
(Other definitions for earwigged that I've seen before include "Illicitly picked up" , "Overheard" , "Eavesdropped" , "Listened" .)