Go along with criminal villain (6)
I believe the answer is:
concur
'go along with' is the definition.
(thesaurus)
'criminal villain' is the wordplay.
'criminal' becomes 'con' (abbreviation for 'convict').
'villain' becomes 'cur'.
'con'+'cur'='CONCUR'
(Other definitions for concur that I've seen before include "Express agreement" , "Agree or happen together" , "Be in accord" , "Stone pile" , "meet" .)