Crossword Genius

Folk singer in prison with a rapper (4,5)

Ross

I believe the answer is:

nick drake

'folk singer' is the definition.

'prison with a rapper' is the wordplay.
'prison' becomes 'nick' (slang term for prison).
'with' says to put letters next to each other.
'a rapper' becomes 'drake'.
'nick'+'drake'='NICK DRAKE'

'in' acts as a link.

I've seen this clue in The Independent.
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