Newcomer talks, getting round code of silence (6)
I believe the answer is:
omerta
'code of silence' is the definition.
(code of silence in the Mafia)
'newcomer talks getting round' is the wordplay.
'getting round' says the answer is hidden in the clue.
'OMERTA' can be found hidden inside 'newcomer talks'.
(Other definitions for omerta that I've seen before include "conspiracy of silence" , "Mafia code of silence; at Rome (anag.)" , "Mafia code of silence, never inform" , "vow of silence" , "Mafia pledge of silence" .)