Direct route (7)
I believe the answer is:
beeline
'direct route' is the definition.
(direct route between two points)
This is all the clue.
(Other definitions for beeline that I've seen before include "Undeviating route" , "Shortest route between A and B" , "Make ........ for - go straight towards like honey collector" , "Most direct route" , "Straight route" .)