Crossword Genius

Nebula makeup (5)

Ross

I believe the answer is:

gases

(Other definitions for gases that I've seen before include "Eg, oxygen, helium" , "Vapours" , "Hydrogen and carbon monoxide, say" , "rabbits" , "Eg, O, H, Ne, CO, etc." .)

I've seen this clue in the King Feature Syndicate.
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