Information that's gathered about eco-politician (5)
I believe the answer is:
green
'eco-politician' is the definition.
(eco-friendly politician)
'information that's gathered about' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'that's gathered' indicates putting letters inside.
'about' becomes 're' ('re' means regarding or about).
'gen' enclosing 're' is 'GREEN'.
(Other definitions for green that I've seen before include "The colour of immaturity" , "raw, as > part of course" , "Proverbial constituent of our moon" , "member of political party" , "Environment-friendly" .)