Usher in haste errs (5)
I believe the answer is:
steer
'usher' is the definition.
The answer and definition can be both to do with motion as well as being verbs in their base form.
Maybe there's a link between them I don't understand?
'in haste errs' is the wordplay.
'in' indicates the answer is hidden within the clue.
'STEER' is hidden within 'haste errs'.
Can you help me to learn more?
(Other definitions for steer that I've seen before include "cox" , "Guide, direct" , "member of herd" , "Drive; control" , "Young bull" .)