Substandard (4)

I believe the answer is:

duff

(Other definitions for duff that I've seen before include "Dud - pud" , "Pudding - of poor quality - Homer Simpson's favourite beer" , "Useless -- broken" , "Pudding -- useless -- Homer Simpson's kind of beer" , "False; steamed pudding" .)

I've seen this clue in The Guardian, the King Feature Syndicate, the Universal, The Wall Street Journal, the LA Times and the USA Today.

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