Mark brings up fellow having one weapon (8)

I believe the answer is:

scimitar

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'weapon' is the definition.
(scimitar is a kind of weapon)

I can't explain the rest of the clue.

(Other definitions for scimitar that I've seen before include "Steel" , "Eastern sword" , "Sword with curved blade used by the Turks and Persians" , "This cut" , "sharp weapon" .)

I've seen this clue in The Mirror.

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