Crossword Genius

Author who created the term 'adsum'? (5)

Ross

I believe the answer is:

dumas

I'm a little stuck... Click here to teach me more about this clue!

'author' is the definition.
(I know that Dumas is a author)

'created the term 'adsum'?' is the wordplay.
'adsum' anagrams to 'DUMAS'.
Though, I am not sure how this is indicated.

'who' is the link.

Can you help me to learn more?

(Other definitions for dumas that I've seen before include "French novelists, father and son" , "French novelist" , "Author of The Three Musketeers" , "Alexandre ---, wrote Count of Monte Cristo" , "Alexander ..... wrote ` `The Three Musketeers' '" .)

I've seen this clue in the Evening Standard.
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