Small trained group (5)
I believe the answer is:
cadre
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small trained group</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cadre that I've seen before include "Core group -- cared (anag)" , "Political group" , "Group of key personnel" , "Raced around with basic military unit" , "Raced (anag) - small central group" .)