Drives or forces (6)
I believe the answer is:
impels
I believe this clue is a double definition.
'drives' is the first definition.
(I've seen this in another clue)
'forces' is the second definition.
(I know this)
(Other definitions for impels that I've seen before include "Drives on in simple way" , "Drives or forces" , "Urges forward" , "Forces, urges to action" , "Spurs" .)