Tory and scoundrel agree (6)
I believe the answer is:
concur
'agree' is the definition.
(I know that agree can be written as concur)
'tory and scoundrel' is the wordplay.
'tory' becomes 'con' (abbreviation for Conservative).
'and' means one lot of letters go next to another.
'scoundrel' becomes 'cur' (cur can mean a despicable person).
'con'+'cur'='CONCUR'
(Other definitions for concur that I've seen before include "Be in accord" , "run together" , "Express agreement" , "Stone pile" , "Agree or happen together" .)