Crossword Genius

Cook's Moore a failure? (3)

Ross

I believe the answer is:

dud

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'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" .)

I've seen this clue in The Sun.
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