Act as informer (4)

I believe the answer is:

sing

'act as informer' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for sing that I've seen before include "Celebrate" , "Act as informer" , "Blow the whistle" , "Croon" , "serenade" .)

I've seen this clue in The Wall Street Journal, The Times and The Telegraph.

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