Shot by firing squad and carried out (8)
I believe the answer is:
executed
'carried out' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for executed that I've seen before include "Done (to death?)" , "Put to death as punishment" , "Beheaded" , "Performed" , "Carried out the task or put to death" .)