Crossword Genius

Soldier shot back loading round (7)

Ross

I believe the answer is:

trooper

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Sun.
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