Substantial quality, organising amnesties (9)

I believe the answer is:

meatiness

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'substantial quality' is the definition.
The definition suggests a singular noun which matches the answer.

'organising amnesties' is the wordplay.
'organising' indicates an anagram.
'amnesties' anagrammed gives 'MEATINESS'.

Can you help me to learn more?

(Other definitions for meatiness that I've seen before include "quality of beef?" , "Brawniness; substance" .)

I've seen this clue in The Daily Express.

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