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Where white lines might be dull? (6-2-3-4)

Ross

I believe the answer is:

middle-of-the-road

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'be dull?' is the definition.

I can't explain the remainder of the clue.

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(Other definitions for middle-of-the-road that I've seen before include "Safe" , "Average" , "Unexciting" , "Avoiding extremes; moderate" , "place for dangerous drivers?" .)

I've seen this clue in The Telegraph.
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