Small piglets (5)
I believe the answer is:
runts
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small piglets</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 runts that I've seen before include "Smallest animals in a litter" , "Small pigs" , "Smallest of litters" , "Littlest pigs" , "Small piglets" .)