Turn down right to throw out (6)
I believe the answer is:
reject
'turn down' is the definition.
(I know that turn down can be written as reject)
'right to throw out' is the wordplay.
'right' becomes 'r' (abbreviation).
'to throw out' becomes 'eject' (synonyms).
'r'+'eject'='REJECT'
(Other definitions for reject that I've seen before include "Refuse to accept or react against" , "Turn something down" , "Refuse to accept, send back" , "Throw out" , "Dismiss (as faulty)" .)