when read backwards its more meaningful - Food chain drive through out break. Initially thought as a reference to an outbreak at Jack in Box food chain (most famous case). 'Jack' is a word we already saw (as in Jack Elam) and Box (as in letterBox). Anyway currently it looks as if this clue is yet again about the 'Fast' keyword, with this reference to Fast food, and there was another clue that talked about eating half your cereal (half of 'Fast food' = 'Fast')