Crossword Genius

It could be hell! (5)

Ross

I believe the answer is:

abyss

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for abyss that I've seen before include "Deep gulf" , "Primal chaos" , "Measureless chasm" , "great depth" , "Hell; hole" .)

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