Drink driving zone, you might say (3)
I believe the answer is:
tea
'drink' is the definition.
(tea is a drink)
'driving zone you might say' is the wordplay.
'driving zone' becomes 'tee' (I've seen this in another clue).
'you might say' indicates a 'sounds like' (homophone) clue.
'tee' sounds like 'TEA'.
(Other definitions for tea that I've seen before include "Assam, e.g." , "(Infused) drink; meal" , "Provide a meal" , "Earl Grey?" , "Leaves for brewing" .)