Birds in a gaggle (5)
I believe the answer is:
geese
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">birds in a gaggle</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 geese that I've seen before include "Stupid people" , "Birds; silly people" , "Grey-lags" , "Water birds; fools" , "Edible water birds" .)