Guides bullocks (6)
I believe the answer is:
steers
This clue is a double definition.
'guides' is the first definition.
('steer' can be a synonym of 'guide')
'bullocks' is the second definition.
('steer' can be a synonym of 'bullock')
(Other definitions for steers that I've seen before include "Castrated bulls" , "Guides or directs, ship or plane" , "Guides or pilots" , "Beefy" , "drives" .)