Cavalry unit (5)
I believe the answer is:
troop
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cavalry unit</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 troop that I've seen before include "musical group perhaps" , "herd" , "Flock; Scout group" , "March" , "Porto (anag.)" .)