Group from north sitting in silence (4)
I believe the answer is:
gang
'group' is the definition.
(gang is a kind of group)
'north sitting in silence' is the wordplay.
'north' becomes 'n' ('N' can be a synonym of 'north').
'sitting in' means one lot of letters goes inside another.
'silence' becomes 'gag' (gagging is a kind of silencing).
'n' placed inside 'gag' is 'GANG'.
'from' is the link.
(Other definitions for gang that I've seen before include "Group of friends, criminals" , "set of tools" , "Band of people, usually criminals" , "Group; clique" , "Group that works or plays together" .)