Police force from the Continent, all concluding (3)
I believe the answer is:
met
'police force' is the definition.
(short for Metropolitan Police Service)
'from the continent all concluding' is the wordplay.
'all concluding' says to take the final letters.
The final letters of 'from the continent' are 'MET'.
(Other definitions for met that I've seen before include "Encountered, came across" , "satisfied" , "Came together, encountered" , "Bumped into" , "Encountered pro tem" .)