Marshal at Waterloo (3)
I believe the answer is:
ney
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">marshal at waterloo</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 ney that I've seen before include "French soldier" , "One of Napoleon's marshals" , "French marshal sound negitative" .)