Appoint in road management (6)
I believe the answer is:
ordain
'appoint' is the definition.
(I've seen this in another clue)
'in road management' is the wordplay.
'management' indicates an anagram.
'in'+'road'='inroad'
'inroad' is an anagram of 'ORDAIN'.
(Other definitions for ordain that I've seen before include "Establish" , "Destine" , "Appoint ceremonially to the priesthood" , "Rule" , "frock" .)