Nab (6)
I believe the answer is:
arrest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nab</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for arrest that I've seen before include "Cause to stop" , "Collar" , "Nab" , "Stop - detain" , "Stop - take into custody" .)