Eg, cutlass or foil (5)
I believe the answer is:
sword
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">eg cutlass</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that Cutlass is a type of sword)</span><br/ ><br/ >'<span class="explanation-format__original">foil</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for sword that I've seen before include "Weapon, often worn ceremonially" , "Bladed weapon" , "Combat" , "Sharp-edged weapon" , "Fencer's weapon" .)