Deli sandwich made with corned beef, Swiss cheese and sauerkraut on rye (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
reuben
(Other definitions for reuben that I've seen before include "old leader of Israel" , "tribe" , "First son of Jacob (OT)" , "Biblical character" , "Jacob's eldest son" .)