The police (3,4)
I believe the answer is:
old bill
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the police</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for old bill that I've seen before include "Met, perhaps" , "Policeman" , "pound note?" , "Cops" , "The police in the UK" .)