Crossword Genius

Gaseous substance (6)

Ross

I believe the answer is:

vapour

'gaseous substance' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for vapour that I've seen before include "Particles suspended in air" , "Visible steam or clouds" , "Gas-like mist" , "Air-like substance created by heating, like gas" , "Boast" .)

I've seen this clue in The Sun.
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