Crossword Genius

On cloud ____ (4)

Ross

I believe the answer is:

nine

(Other definitions for nine that I've seen before include "and 23: Flash in the pan" , "A perfect square" , "So many" , "It's dialled three times in an emergency" , "Number of feline existences" .)

I've seen this clue in the Penny Press and The Star Tribune.
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