Crossword Genius

Singular clothes, simply no good (3)

Ross

I believe the answer is:

dud

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This clue might be a double definition.

'singular clothes' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'simply no good' is the second definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for dud that I've seen before include "Bullet that fails to fire" , "Something useless - a palindrome" , "Counterfeit article" , "Failed, worthless thing" , "Palindrome for a flop" .)

I've seen this clue in the Evening Standard.
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