Crossword Genius

What fogs up a bathroom mirror (5)

Ross

I believe the answer is:

steam

(Other definitions for steam that I've seen before include "Kettle emission" , "It's water mist, mates" , "Vapour; energy" , "Vapour from water at boiling point" , "Old-fashioned power" .)

I've seen this clue in the Universal.
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