He's a failure! (3)
I believe the answer is:
dud
I believe this is a double definition.
'he's' is the first definition.
'a failure' is the second definition.
(dud is a kind of failure)
(Other definitions for dud that I've seen before include "Palindrome for a flop" , "Fake -- failure" , "Faulty" , "Not functioning" , "Explosive not detonating" .)