Food company restricted by ban (5)
I believe the answer is:
bacon
'food' is the definition.
(bacon is a kind of food)
'company restricted by ban' is the wordplay.
'company' becomes 'co' (abbreviation).
'restricted by' means one lot of letters goes inside another (I've seen this in other clues).
'co' placed inside 'ban' is 'BACON'.
(Other definitions for bacon that I've seen before include "sizzler" , "Author" , "Thin slices of smoked ham" , "Breakfast meat?" , "Sizzling" .)