Drive from heath across top of town (5)
I believe the answer is:
motor
'drive' is the definition.
('motor' can be a synonym of 'drive')
'heath across top of town' is the wordplay.
'heath' becomes 'moor' (I've seen this before).
'across' means one lot of letters goes inside another.
'top of' indicates taking the first letters.
The first letter of 'town' is 't'.
'moor' placed around 't' is 'MOTOR'.
'from' is the link.
(Other definitions for motor that I've seen before include "Machine that converts energy into motion" , "Move fast" , "Car (colloq,)" , "Car; powered machine" , "Move quickly" .)