Party food for the health conscious (6)
I believe the answer is:
greens
I believe this is a double definition.
'party' is the first definition.
(the Green Party is a political party)
'food for the health conscious' is the second definition.
(eat your greens)
(Other definitions for greens that I've seen before include "food" , "Putting areas" , "Nature lovers" , "Political party" , "Vegetables - on the golf course?" .)