Skin at the base of a nail (7)
I believe the answer is:
cuticle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">skin at the base of a nail</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 cuticle that I've seen before include "Protective layer" , "area of dead skin" , "Dead skin on hand" , "finger has one" , "Skin at the base of a nail" .)