Crossword Genius

Simply has to exist in numbers, in deep space (5)

Ross

I believe the answer is:

chasm

I'm a little stuck... Click here to teach me more about this clue!

'space' is the definition.
(chasm is a kind of space)

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

Can you help me to learn more?

(Other definitions for chasm that I've seen before include "Abyss" , "One yawns" , "A deep opening in the earth" , "Deep fissure; gulf" , "One gapes" .)

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