Small chicken (6)
I believe the answer is:
bantam
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small chicken</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 bantam that I've seen before include "Lightweight boxer and chicken" , "weight of a pug" , "Small chicken - small soldier" , "Dwarf variety of domestic fowl" , "Lightweight boxer and hen" .)