Musketeer admitted to that hospital (5)

I believe the answer is:

athos

(Other definitions for athos that I've seen before include "Greek mount; one of the Three Musketeers" , "Colleague of Porthos, Aramis" , "Greek mountain; one of the three musketeers" , "Brave soldier" , "Appropriating" .)

I've seen this clue in The Sun.

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