Soprano's group (3,5)
(Another definition for the mafia that I've seen is " sinister influence".)
'soprano's group?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mob that I've seen before include "Crime syndicate or disorderly crowd" , "An undisciplined gang of people" , "press round" , "Ugly crowd" , "An unruly or uncontrolled gang" .)