Foil (6)
(Other definitions for stymie that I've seen before include "Obstruction (originally at golf)" , "'Hinder, prevent progress (6)'" , "Thwart, foil" , "Block or thwart, as on golf course" , "Old putting problem" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">foil</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that foil can be written as thwart)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for thwart that I've seen before include "Hinder or prevent" , "check" , "Oppose successfully" , "Frustrate, prevent from doing" , "seat for oarsman" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">foil</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for epee that I've seen before include "Fighting blade" , "Foil for riposte" , "Fencing blade" , "Type of sword" , "It may offer riposte" .)