Man of arms (8)
I believe the answer is:
gunsmith
'man of arms' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'man of arms' is the wordplay.
I cannot really understand how this works, but
'man' could be 'smith' and 'smith' is located in the answer.
'arms' could be 'gun' (gun is a kind of arms) and 'gun' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for gunsmith that I've seen before include "Weapons maker" , "One makes or sells small firearms" , "Maker of firearms" , "Thin mugs (anag.)" , "I can arm you" .)