Military flute (4)
I believe the answer is:
fife
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">military flute</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 fife that I've seen before include "Historic Scottish county, bordering on the Firth of Forth" , "High-pitched flute played in drum bands" , "Type of flute: Scottish council area" , "Scottish division" , "Small shrill flute" .)