Prod; provoke (4)
I believe the answer is:
goad
This clue is a double definition.
'prod' is the first definition.
(goading is a kind of prodding)
'provoke' is the second definition.
(goading is a kind of provoking)
(Other definitions for goad that I've seen before include "A dog to urge on" , "Spur, urge on" , "Prod with a pointed stick" , "Act as stimulus - with pointed stick?" , "that provides motivation" .)