Long dagger (8)
I believe the answer is:
stiletto
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">long dagger</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 stiletto that I've seen before include "Slender-bladed dagger - heel" , "High-heeled shoe" , "Possible cause of stabbing pains" , "Tapering dagger" , "Dagger; tapered heel" .)