Part of the large intestine (5)
I believe the answer is:
colon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">part of the large intestine</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for colon that I've seen before include "that may cut sentence" , "Part of body; some punctuation" , "Punctuation mark; gut" , "Panamanian port" , "unit of foreign currency" .)