Small growth (5)
I believe the answer is:
polyp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small growth</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 polyp that I've seen before include "Vascular growth" , "Small growth on a mucous membrane" , "Coral form" , "Small tumour" , "Small unwanted growth in the body" .)