Loser at Waterloo (8)
I believe the answer is:
napoleon
'loser at waterloo' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for napoleon that I've seen before include "card game" , "In France, former sovereign" , "French emperor, d.1821" , "Gold twenty franc piece" , "Extended nap" .)