Farm birds (5)
I believe the answer is:
geese
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">farm birds</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 geese that I've seen before include "They can be Barnacle, Brent or Canadian" , "Sixth day of Christmas gift" , "wingers" , "0 Water birds" , "Stupid people" .)