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Inferior school shut (7)

Ross

I believe the answer is:

schlock

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'inferior' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I can't see?

'school shut' is the wordplay.
'school' becomes 'sch' (common abbreviation).
'shut' becomes 'lock' (I can't justify this - if you can you should give a lot more credence to this answer).
'sch'+'lock'='SCHLOCK'

Can you help me to learn more?

(Another definition for schlock that I've seen is " Trashy (Yiddish)".)

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