Legendary warrior's degenerate weapon mentioned (4)

I believe the answer is:

ajax

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'legendary warrior's' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for ajax that I've seen before include "Son of Telamon, hero of Trojan War" , "Mythical Greek hero - Amsterdam football club" , "Amsterdam football team" , "Legendary warrior" , "Mythical Greek hero, who fought against Troy" .)

I've seen this clue in The Telegraph.

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