Archer's missile (5)
I believe the answer is:
arrow
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">archer's missile</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for arrow that I've seen before include "Missile with a point" , "Mark to indicate direction" , "Item in a quiver" , "production of Fletcher?" , "Dart; pointer" .)