Guide; young ox (5)
I believe the answer is:
steer
This clue is a double definition.
'guide' is the first definition.
(I know that guide can be written as steer)
'young ox' is the second definition.
(I've seen this in another clue)
(Other definitions for steer that I've seen before include "Young bull" , "Cattle - guide" , "Guide (eg, a ship)" , "The animal to direct" , "farm animal" .)