Driver on a film set (4)
I believe the answer is:
adam
'driver on a film set' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for adam that I've seen before include "Robert ..., ... Clayton" , "Robert-, eighteenth century Scots architect" , "According to the Bible, progenitor of the human race" , "Robert -, Sc. architect" , "The first known ancestor" .)