Officer studies information schematically presented (9)
I believe the answer is:
constable
'officer' is the definition.
(a police officer)
'studies information schematically presented' is the wordplay.
'studies' becomes 'cons' (to con is to study or revise).
'information schematically presented' becomes 'table' (a table of data).
'cons'+'table'='CONSTABLE'
(Other definitions for constable that I've seen before include "He painted" , "the governor of a royal castle" , "Policeman - landscape artist" , "Flatford Mill painter" , "See 1" .)