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Old money criminal in prison loves (6,5)

Ross

I believe the answer is:

silver spoon

I'm a little stuck... Click here to teach me more about this clue!

'old money' is the definition.
(I know that old money can be written as silver spoon)

'criminal in prison loves' is the wordplay.
'prison loves' anagrams to 'SILVER SPOON'.
Though, I'm unsure how this is indicated.

Can you help me to learn more?

(Another definition for silver spoon that I've seen is " Content of a wealthy baby's mouth!".)

I've seen this clue in The Sunday Times and The Times.
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