Healthy food for politicians (6)
I believe the answer is:
greens
I believe this is a double definition.
'healthy food' is the first definition.
(informal term for vegetables)
'for politicians' is the second definition.
(members of the Green Party)
(Other definitions for greens that I've seen before include "Signs people should go" , "Veg" , "party politicians" , "Political party" , "Leaves" .)