Politician about to get into dope (5)
I believe the answer is:
green
'politician' is the definition.
(eg member of the Green Party)
'about to get into dope' is the wordplay.
'about to get' becomes 're' (I've seen this in other clues).
'into' indicates putting letters inside.
'dope' becomes 'gen' (both can mean information).
're' put into 'gen' is 'GREEN'.
(Other definitions for green that I've seen before include "Environmentally concerned" , "Area around a golf hole" , "Concerned with the environment in colourful way" , "Consultative document" , "Politician perhaps" .)