A style that's modern and right on the map! (4)
I believe the answer is:
mode
'a style' is the definition.
('mode' can be a synonym of 'style')
'modern and right on the map' is the wordplay.
'modern' becomes 'mod' (synonyms).
'and' is a charade indicator (letters next to each other).
'right on the map' becomes 'e' (I can't explain this - if you can you should give a lot more credence to this answer).
'mod'+'e'='MODE'
'that's' is the link.
Can you help me to learn more?
(Other definitions for mode that I've seen before include "Way, method" , "Style; statistical value" , "Style of dome" , "Way of operation" , "Trend" .)