Some whistle blowers (4)
I believe the answer is:
refs
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">some whistle blowers</span>' is the definition.<br/ ><span class="explanation-format__explanation">(referees blow whistles)</span><br/ ><br/ >This is all the clue.<br/ ></span>
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