Feed or foster (7)
I believe the answer is:
nourish
I believe this clue is a double definition.
'feed' is the first definition.
(I know that nourish is a type of feed)
'foster' is the second definition.
(I've seen this before)
(Other definitions for nourish that I've seen before include "Nurture, sustain" , "Feed, sustain" , "Keep alive and well with food" , "encourage growth" , "Supply with food, keep well" .)