Croon (4)

I believe the answer is:

sing

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

This is the entire clue.

(Other definitions for sing that I've seen before include "Chant" , "Act as informer" , "Inform - carol" , "Croon" , "Warble" .)

I've seen this clue in The Daily Mail, The Telegraph, The Star Tribune, The Mirror and the Evening Standard.

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