Order straightforward guide (6)
I believe the answer is:
direct
I believe this is a triple definition!
'order' is the first definition.
(directing is a kind of ordering)
'straightforward' is the second definition.
(straightforward can mean direct)
'guide' is the third definition.
(I know that guide is a more specific form of direct)
(Other definitions for direct that I've seen before include "Moving without changing direction or stopping" , "As the crow flies" , "Credit (anag) - steer" , "Show where to go - straight" , "Aim; straight" .)