Flop (3)

'flop' is the definition.
(I know that flop can be written as dud)
This is all the clue.
(Other definitions for dud that I've seen before include "Fake -- failure" , "Failing to work properly" , "Something useless - a palindrome" , "Palindrome for a flop" , "Phoney" .)
'flop' is the definition.
(I know that flop can be written as failure)
This is the entire clue.
(Other definitions for failure that I've seen before include "Collapse; disaster" , "Lack of success, or he who lacks it" , "No-hoper" , "Defeat" , "[OPPOSITE OF] success" .)