Knight reportedly obnoxious and obsequious (7)
I believe the answer is:
servile
'obsequious' is the definition.
(similar in meaning)
'knight reportedly obnoxious' is the wordplay.
'knight' becomes 'sir' (a knight has the title Sir).
'reportedly' shows a homophone (sound like).
'obnoxious' becomes 'vile' (vile means obnoxious or unpleasant).
'sir' sounds like 'ser'.
'ser'+'vile'='SERVILE'
'and' is the link.
(Other definitions for servile that I've seen before include "Submissive or fawning" , "Slave-like" , "Cringing, fawning" , "Toadying" , "Excessively eager to please" .)