26 across
Drive
a
good
line
in
test
of
acceleration
(4,4)
Drive a good line in test of acceleration (4,4)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
Here test of acceleration is the definition — a drag race being exactly that, a contest to see who gets up to speed fastest. For the wordplay, it's all bolted together piece by piece: DR (short for Drive), then A (a), then G (the usual abbreviation for good), and finally RACE (used for line, as in lineage or ancestry). String DR, A, G and RACE together and you get DRAG RACE.