Man, that weapon is old! (5)

I believe the answer is:

lance

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'man' is the definition.
(man's name)

I can't explain the remainder of the clue.

(Other definitions for lance that I've seen before include "Clean (anag) -- weapon" , "Shafted weapon used on horseback" , "Spear for a horse-soldier" , "Long-shafted weapon" , "Spear carried by mounted soldier" .)

I've seen this clue in the Evening Standard.

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