Straight run (6)
I believe the answer is:
direct
I believe this is a double definition.
'straight' is the first definition.
('direct' is associated in meaning with 'straight')
'run' is the second definition.
(thesaurus)
(Other definitions for direct that I've seen before include "Show where to go - straight" , "Control, supervise" , "Straightforward, frank" , "Show someone the way" , "Supervise; unambiguous" .)