Soldier shot back loading round (7)
I believe the answer is:
trooper
'soldier' is the definition.
(I know that trooper is a type of soldier)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for trooper that I've seen before include "Cavalry 21" , "Private soldier" , "He swears" , "ship" , "Cavalryman" .)