Eldest of the Musketeers (5)

I believe the answer is:

athos

(Other definitions for athos that I've seen before include "Greek mountain; one of the three musketeers" , "Comrade of Porthos and Aramis" , "Brave soldier" , "Mount - musketeer" , "Dumas musketeer" .)

I've seen this clue in the King Feature Syndicate.

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