Small arrow (4)
I believe the answer is:
dart
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small arrow</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 dart that I've seen before include "Small narrow pointed missile" , "Tuck; arrow" , "one destined to go on board?" , "Devon river - bound - race" , "Shoot out" .)