Drive the bullock (5)
I believe the answer is:
steer
This clue is a double definition.
'drive' is the first definition.
(I've seen this in another clue)
'the bullock' is the second definition.
(synonyms)
(Other definitions for steer that I've seen before include "Navigate" , "Direct, fix course" , "Exercise control" , "piece of advice" , "give guidance" .)