Dissolute, but I'm getting the message (7)
I believe the answer is:
immoral
'dissolute' is the definition.
(similar in meaning)
'i'm getting the message' is the wordplay.
'getting' means one lot of letters go next to another.
'the message' becomes 'moral' (moral is a kind of message).
'im'+'moral'='IMMORAL'
'but' is the link.
(Other definitions for immoral that I've seen before include "Without values" , "Ignoring right and wrong" , "Corrupt - dissolute" , "Promiscuous" , "bad!" .)