Crossword Genius

I'm so taken aback by volume of the Universe (6)

Ross

I believe the answer is:

cosmic

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

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cosmic that I've seen before include "Johann Sebastian --" , "Great" , "Enormous" , "To do with the whole universe" , "Significant" .)

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