Right on the map (4)
I believe the answer is:
east
'right on the map' is the definition.
(I've seen this in another clue)
'on the map' is the wordplay.
'on' is a charade indicator (letters next to each other).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'map' becomes 'eas' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
't' put after 'eas' is 'EAST'.
Can you help me to learn more?
(Other definitions for east that I've seen before include "Direction of the rising sun" , "Asia" , "Ninety degree bearing" , "course" , "major point" .)