Small group (4)
I believe the answer is:
trio
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small group</span>' is the definition.<br/ ><span class="explanation-format__explanation">(group of three people)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for trio that I've seen before include "Three together" , "Three of a kind" , "Work for three" , "A group or set of three" , "Ensemble musical piece, eg Beethoven's 'Archduke'" .)