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)
'politicians' is the second definition.
(members of the Green Party)
'for' acts as a link.
(Other definitions for greens that I've seen before include "Signs people should go" , "Veg" , "party politicians" , "Political party" , "Leaves" .)