Crossword Genius

Act as informer (4)

Ross

I believe the answer is:

sing

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">act as informer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 Times, The Wall Street Journal and The Telegraph.
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