Sound like a pig (4)
I believe the answer is:
oink
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sound like a pig</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 oink that I've seen before include "Sound from a sty" , "Piggish noise" , "What farmer hears" , "Noise a pig makes" , "Pig's grunt" .)