Arrest, apprehend (3)
I believe the answer is:
nab
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">arrest</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that arrest can be written as nab)</span><br/ ><br/ >'<span class="explanation-format__original">apprehend</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for nab that I've seen before include "nail" , "Collar (sl.)" , "Catch; grab suddenly" , "Catch (thief) (colloq.)" , "Cop" .)