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Prison staff returning drug to Chalky or Dusty, say (8)

Ross

I believe the answer is:

nickname

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'chalky or dusty say' is the definition.
I can't judge whether this definition defines the answer.

'prison staff returning drug' is the wordplay.
'prison' becomes 'nick' (slang term for prison).
'staff' becomes 'man' (as in staffing or manning a particular place).
'returning' shows that the letters should be reversed in order.
'drug' becomes 'e' (E is another name for ecstasy).
'man' in reverse letter order is 'nam'.
'nick'+'nam'+'e'='NICKNAME'

'to' is the link.

Can you help me to learn more?

(Other definitions for nickname that I've seen before include "term for someone" , "Jack the Ripper, for example" , "Cognomen" , "Friendly appellation by which person is known" , "Affectionate or invented appellation, not one's own" .)

I've seen this clue in The Guardian.
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