Bad weather with the possibility of turning good (3)

I believe the answer is:

fog

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'bad weather with the possibility' is the definition.
I can't tell whether this definition defines the answer.

'of turning good' is the wordplay.
'turning' is a reversal indicator.
'good' becomes 'g' (abbreviation).
'of' backwards is 'fo'.
'fo'+'g'='FOG'

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(Other definitions for fog that I've seen before include "Obscure" , "Thick mist" , "Miasma" , "second growth of grass" , "Pea-souper" .)

I've seen this clue in the Evening Standard.

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