Halt, having shot pursuing bear (10)
I believe the answer is:
standstill
'halt' is the definition.
(I know that standstill is a type of halt)
'shot pursuing bear' is the wordplay.
'shot' becomes 'still' (I can't justify this - if you can you should give a lot more credence to this answer).
'pursuing' is a charade indicator (letters next to each other).
'bear' becomes 'stand' (bear can mean to stand or endure).
'still' put after 'stand' is 'STANDSTILL'.
'having' acts as a link.
Can you help me to learn more?
(Other definitions for standstill that I've seen before include "stoppage" , "Complete stop" , "Situation without movement or activity" , "lack of movement" , "arrest" .)