Thin cut (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thin cut</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for slit that I've seen before include "Narrow rent" , "Long narrow opening" , "Narrow aperture" , "Long straight cut" , "Long narrow cut" .)
(Other definitions for sliver that I've seen before include "Sharp piece (of glass)" , "just a little bit" , "Wafer-thin slice" , "Splinter of wood" , "Piece cut off" .)