A novel musketeer (or a Tommy?) (5)

I believe the answer is:

athos

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'a novel musketeer' is the definition.
'athos' can be an answer for 'musketeer' (musketeer from The Three Musketeers). I am not sure about the 'a novel' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for athos that I've seen before include "Mount - musketeer" , "Colleague of Porthos, Aramis" , "Appropriating" , "Greek monastic mountain" , "Greek mountain; one of the three musketeers" .)

I've seen this clue in the Evening Standard.

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