Crossword Genius

Turn informer twice in NY prison (4,4)

Ross

I believe the answer is:

sing sing

'ny prison' is the definition.
(I've seen this before)

'turn informer twice' is the wordplay.
'turn informer' becomes 'sing' (I've seen this before).
'twice' shows that letters should be duplicated.
'sing' doubled is 'SING-SING'.

'in' is the link.

(Other definitions for sing sing that I've seen before include "NY prison" , "New York state prison" .)

I've seen this clue in The Times.
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