Soldier perhaps, firing missiles primarily? (6)
I believe the answer is:
archer
'soldier' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for archer that I've seen before include "ex-con" , "stars" , "Jeffrey --, writer" , "part of circle woman's joined" , "One uses a bow and arrows" .)