Crossword Genius

Monster - English writer almost entirely upset (5)

Ross

I believe the answer is:

hydra

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'monster' is the definition.
(Hydra is an example)

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

Can you help me to learn more?

(Other definitions for hydra that I've seen before include "Femme fatale of legend" , "Water monster" , "Mythic monster with nine heads" , "Proliferating-head monster" , "Persistent trouble" .)

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