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' suggests the final letters (the letter at the back).
'put an' becomes 'p' (this might be a standard abbreviation I've not previously seen).
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" .)