Stiletto or dirk (6)
I believe the answer is:
dagger
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">stiletto</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">dirk</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for dagger that I've seen before include "Stabbing weapon" , "that has an incisive point" , "Hand weapon" , "''Is this a ... which I see before me'' (Macbeth)" , "Macbeth's weapon" .)