Crossword Genius

Bad weather for the motorist? (7,4)

Ross

I believe the answer is:

driving rain

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'bad weather for the motorist?' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'bad weather for the motorist?' is the wordplay.
'bad weather' becomes 'rain' (rain is an example of bad weather).
'for' means one lot of letters go next to another (I've seen this in other clues).
'the motorist?' becomes 'driving' (I can't explain this - if you can you should give a lot more credence to this answer).
'rain' after 'driving' is 'DRIVING RAIN'.

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I've seen this clue in the Evening Standard.
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