Misbehave in a car (5)
I believe the answer is:
speed
This could be a double definition.
'misbehave' is the first definition.
Although both the answer and definition are verbs in their base form, I cannot see how one could define the other.
'car' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'in a' is the link.
Can you help me to learn more?
(Other definitions for speed that I've seen before include "Rate of travel" , "Rtae of progress" , "The going rate" , "Alacrity" , "Swiftness" .)