Instruct terrible court (6)
I believe the answer is:
direct
'instruct' is the definition.
(directing is a kind of instructing)
'terrible court' is the wordplay.
'terrible' becomes 'dire' (synonyms).
'court' becomes 'ct' (abbreviation used in road names).
'dire'+'ct'='DIRECT'
(Other definitions for direct that I've seen before include "Credit (anag) - steer" , "Show someone the way" , "Straight; manage" , "Moving without changing direction or stopping" , "Frank; supervise" .)