Crossword Genius

But Kenneth was no extra (4)

Ross

I believe the answer is:

more

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'extra' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for more that I've seen before include "To a greater extent" , "author" , "A greater amount" , "victim of Henry" , "Writer" .)

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