Rightward, on a map (4)
I believe the answer is:
east
'rightward on a map' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for east that I've seen before include "the way the Wise Men came from" , "Cardinal compass point" , "Direction of the Orient" , "Bearing of ninety degrees" , "Compass bearing" .)