Jealous politician (5)
I believe the answer is:
green
I believe this is a double definition.
'jealous' is the first definition.
(thesaurus)
'politician' is the second definition.
(eg member of the Green Party)
(Other definitions for green that I've seen before include "Genre (anag.)" , "Envious -- environmentalist" , "Grassy area; politician" , "Inexperienced - olive coloured" , "Environmentally concerned" .)