Heaviest fencing sword (4)
I believe the answer is:
epee
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">heaviest fencing sword</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for epee that I've seen before include "Type of sword" , "Fencing weapon" , "Fencing sword, heavier than a foil" , "Duelling weapon" , "sports equipment" .)