Got together in force (3)
I believe the answer is:
met
I believe this is a double definition.
'got together' is the first definition.
(meeting is a kind of getting together)
'force' is the second definition.
(I've seen this in other clues)
'in' is the link.
(Other definitions for met that I've seen before include "Came together, encountered" , "Encountered, came across" , "Opera company" , "Encountered or touched" , "Came across - police in London" .)