Invest in road layout (6)
I believe the answer is:
ordain
'invest' is the definition.
(ordaining is a kind of investing)
'in road layout' is the wordplay.
'layout' indicates anagramming the letters (an alternative layout of the letters).
'in'+'road'='inroad'
'inroad' anagrammed gives 'ORDAIN'.
(Other definitions for ordain that I've seen before include "Install as priest" , "Initiate as priest" , "Decree authoritatively" , "Invest with priestly authority" , "Decree or consecrate" .)