Breakfast sandwich base (5)
I believe the answer is:
bagel
'breakfast sandwich base' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bagel that I've seen before include "Hard doughnut-shaped roll" , "Jewish baked roll" , "Ring-shaped bread roll" , "Ring-shaped bread product" , "Hard bread roll in shape of ring" .)