Sausage in a long roll (3,3)
(Other definitions for hot dog that I've seen before include "Item of fast food" , "grub?" , "Sausage in a bap" , "Sausage in bread-roll for thermal canine" , "Long roll containing sausage" .)
(Other definitions for hotdog that I've seen before include "snack" , "Food served at arena" , "junk food" .)