In custody (5,6)
I believe the answer is:
under arrest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in custody</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for under arrest that I've seen before include "Detained" , "help the police with their enquiries?" .)