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Below par albums Ron scrapped (9)

Ross

I believe the answer is:

subnormal

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'below par' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'albums ron scrapped' is the wordplay.
'albums ron' can be anagrammed to 'SUBNORMAL'.
However, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for subnormal that I've seen before include "Of low intelligence" , "not being over-bright" .)

I've seen this clue in The Independent.
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