Crossword Genius

In bad visibility, note the footballer's error (3)

Ross

I believe the answer is:

fog

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'in bad visibility' is the definition.
'fog' can be an answer for 'visibility' (thesaurus). I am not certain of the 'in bad' bit.

'note the footballer's error' is the wordplay.
'note' becomes 'f' (musical note).
'the footballer's error' becomes 'og' (I can't justify this - if you can you should give a lot more credence to this answer).
'f'+'og'='FOG'

Can you help me to learn more?

(Other definitions for fog that I've seen before include "Impenetrable mist" , "Confusion" , "second growth of grass" , "Heavy mist" , "Miasma" .)

I've seen this clue in the Evening Standard.
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