Crossword Genius

Monster therefore arises (4)

Ross

I believe the answer is:

ogre

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'monster' is the definition.
(fairy tale monster)

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

Can you help me to learn more?

(Other definitions for ogre that I've seen before include "Wicked giant" , "Man-eating monster of fairy tales" , "character in 'Puss in Boots'" , "Bogeyman" , "Fairy tale giant" .)

I've seen this clue in The Telegraph.
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