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Material heartless old jailer read aloud (6,3)

Ross

I believe the answer is:

turkey red

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

'heartless old jailer read aloud' is the wordplay.
'heartless' suggests removing the centre.
'old jailer' becomes 'turnkey' (historical term for a jailer).
'aloud' indicates a 'sounds like' (homophone) clue.
'turnkey' with its centre taken out is 'turkey'.
'read' is a homophone of 'red'.
'turkey'+'red'='TURKEY RED'

Can you help me to learn more?

(Another definition for turkey red that I've seen is " Textile dye".)

I've seen this clue in The Times.
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