Playing harp, George is someone into charts (10)
I believe the answer is:
geographer
'someone into charts' is the definition.
(charts can mean maps)
'playing harp george' is the wordplay.
'playing' is an anagram indicator.
'harp'+'george'='harpgeorge'
'harpgeorge' with letters rearranged gives 'GEOGRAPHER'.
'is' acts as a link.
(Other definitions for geographer that I've seen before include "Student of Earth's features" , "Person studying the physical aspects of the earth" , "Mercator?" .)