Shoots back to put an end to it (4)
I believe the answer is:
stop
'end to it' is the definition.
'stop' can be an answer for 'end' (stopping is a kind of ending). I am not sure about the 'to it' bit.
'shoots back to put an' is the wordplay.
'back' says to take the final letters.
'put an' becomes 'p' (this might be a standard abbreviation which I don't know about).
The last letter of 'shoots' is 's'.
's'+'to'+'p'='STOP'
Can you help me to learn more?
(Other definitions for stop that I've seen before include "period in US" , "This watch is used to time races" , "It could be the organist's principal" , "Intercept" , "Arrest" .)