Dull place that drivers should steer clear of? (6-2-3-4)
I believe the answer is:
middle-of-the-road
'dull' is the definition.
'place that drivers should steer clear of?' is the wordplay.
I cannot really understand how this works, but
'place' could be 'middle' (middling is a kind of placing) and 'middle' is located in the answer.
'of?' could be 'o' and 'o' is found within the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for middle-of-the-road that I've seen before include "Average" , "Unexciting" , "place for dangerous drivers?" , "Avoiding extremes; moderate" , "Safe" .)