Only half the local outlets offering healthy food? (4)
I believe the answer is:
bran
'healthy food?' is the definition.
(bran is a healthy food)
'only half the local outlets' is the wordplay.
'only half' indicates taking half.
'the local outlets' becomes 'branches' (local branches of a business).
'branches' cut in half is 'BRAN'.
'offering' acts as a link.
(Other definitions for bran that I've seen before include "Food from the husks of cereal grains" , "Coarse meal for horse food" , "Health food" , "Milled grain husk" , "Husks of corn" .)