V-shaped incision (5)
I believe the answer is:
notch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">v-shaped incision</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 notch that I've seen before include "Nick - score" , "Dent" , "Indentation, nick" , "Point or degree in a scale" , "Incision; indentation" .)