Unusually terse guidance (5)
I believe the answer is:
steer
'guidance' is the definition.
(I know that steer is a type of guidance)
'unusually terse' is the wordplay.
'unusually' indicates an anagram.
'terse' is an anagram of 'STEER'.
(Other definitions for steer that I've seen before include "Guide (a ship, car, etc)" , "farm animal" , "bovine individual?" , "beef producer" , "Pilot a boat in desired direction" .)