Guide cattle … (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)
'cattle' is the second definition.
(steer is a kind of cattle)
(Other definitions for steer that I've seen before include "Direct; bullock" , "Exercise control" , "Guide, direct" , "Cattle - guide" , "Guide the bull" .)