Lead an ox (5)
I believe the answer is:
steer
I believe this is a double definition.
'lead' is the first definition.
('steer' can be a synonym of 'lead')
'an ox' is the second definition.
(I've seen this before)
(Other definitions for steer that I've seen before include "cox" , "Guide (eg, a ship)" , "Manoeuvre" , "member of herd" , "Guide, control" .)