Heath has time for a car (5)
I believe the answer is:
motor
'for a car' is the definition.
(motor can informally mean a car)
'heath has time' is the wordplay.
'heath' becomes 'moor' (both can mean a type of landscape).
'has' means one lot of letters goes inside another.
'time' becomes 't' (abbreviation).
'moor' going around 't' is 'MOTOR'.
(Other definitions for motor that I've seen before include "Engine - relating to movement" , "Drive" , "Car; powered machine" , "Car; travel quickly" , "Wheels" .)