Take weapons from police officers and a resident magistrate (6)
I believe the answer is:
disarm
'take weapons from' is the definition.
(I've seen this before)
'police officers and a resident magistrate' is the wordplay.
'police officers' becomes 'DIs' (detective inspectors).
'and' means one lot of letters go next to another.
'resident magistrate' becomes 'rm' (this could be a standard abbreviation which I don't know about).
'dis'+'a'+'rm'='DISARM'
Can you help me to learn more?
(Other definitions for disarm that I've seen before include "Abandon weapons" , "to allay hostility" , "Placate" , "Relieve of weapons" , "Take weapons from or captivate" .)