Healthier, having swallowed right bit of food (7)
I believe the answer is:
fritter
'food' is the definition.
(a fried food)
'healthier having swallowed right bit of' is the wordplay.
'healthier' becomes 'fitter' ('fit' can be a synonym of 'healthy').
'having swallowed' indicates putting letters inside.
'bit of' indicates taking the first letters.
The initial letter of 'right' is 'r'.
'fitter' enclosing 'r' is 'FRITTER'.
(Other definitions for fritter that I've seen before include "Item cooked in batter" , "while away?" , "Piece of meat, etc., coated in batter and fried" , "Hot food" , "Something battered and fried" .)