Crossword Genius

A bad atmosphere (3)

Ross

I believe the answer is:

fug

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This might be a double definition.

'a bad' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'atmosphere' is the second definition.
(fug is a kind of atmosphere)

Can you help me to learn more?

(Other definitions for fug that I've seen before include "Fetidity" , "Close atmosphere" , "Warm, stuffy atmosphere" .)

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