Frankfurter in a roll (3,3)
I believe the answer is:
hot dog
'frankfurter in a roll' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for hot dog that I've seen before include "Sausage in breae roll" , "Meat in roll" , "Item of fast food" , "Sausage in bread-roll for thermal canine" , "One panting" .)