Crossword Genius

Person walking miles leaves old soldier (6)

Ross

I believe the answer is:

archer

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'old soldier' is the definition.

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 "One uses a bow and arrow" , "Sagittarius - bowman" , "was more roguish" , "User of bows and arrows" , "Irish parliament" .)

I've seen this clue in The Sun.
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