Broke arm in bar - you could press charges with this
I believe the answer is:
ramrod
'you could press charges with this' is the definition.
The definition suggests a singular noun which matches the answer.
'broke arm in bar' is the wordplay.
'broke' indicates anagramming the letters.
'in' means one lot of letters goes inside another.
'bar' becomes 'rod' (I've seen this in other clues**).
'arm' with letters rearranged gives 'amr'.
'amr' inserted into 'rod' is 'RAMROD'.
Can you help me to learn more?
(Other definitions for ramrod that I've seen before include "Shaft for loading or cleaning gun" , "one into guns?" , "Martinet" , "Gun cleaner, proverbially stiff and straight" , "Pole for pushing charge into a gun barrel" .)