Nonstarter (3)
'nonstarter' is the definition.
(dud is a kind of nonstarter)
This is the entire clue.
(Other definitions for dud that I've seen before include "Just a palindromic flop" , "A thing failing to work" , "Counterfeit article" , "Not functioning" , "Failed, worthless thing" .)
'nonstarter' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sub that I've seen before include "Navy vessel" , "Replacement" , "Reserve (abbr)" , "Underwater vessel" , "Prefix denoting under" .)