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Grass, direct shortcut for drivers (3,3)

Ross

I believe the answer is:

rat run

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'shortcut for drivers' is the definition.
I know nothing about this answer so I can't tell whether this works.

'grass direct' is the wordplay.
'grass' becomes 'rat' (both can mean a snitch or informer).
'direct' becomes 'run' (running is a kind of directing).
'rat'+'run'='RAT RUN'

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(Other definitions for rat run that I've seen before include "'Side-road used to dodge traffic (3,3)'" , "Busy rush hour side road" , "'Busy side-road during rush hour (3,3)'" , "Side street much used by cars in rush hours" , "Busy rush-hour side road" .)

I've seen this clue in The Sunday Times and The Times.
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