Crossword Genius

More wide possibly (5)

Ross

I believe the answer is:

extra

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for extra that I've seen before include "Additional, more than expected" , "Spare" , "to boot" , "One in crowd scene" , "on top" .)

I've seen this clue in The Times.
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