Crossword Genius

Small cat polluted air (4)

Ross

I believe the answer is:

smog

'polluted air' is the definition.
(I've seen this in another clue)

'small cat' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'cat' becomes 'mog' (informal British term).
's'+'mog'='SMOG'

(Other definitions for smog that I've seen before include "Pollution haze/fog" , "Fog and smoke mix" , "Pollution fog" , "Bad visibility caused by emissions from chimneys" , "Polluted atmosphere" .)

I've seen this clue in The Sun.
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