Cook's Moore a failure? (3)
I believe the answer is:
dud
'failure?' is the definition.
(dud is a kind of failure)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for dud that I've seen before include "(Explosive) failure" , "Not functioning" , "Forged" , "A palindromic washout" , "Failing in its function" .)