Thick slice (4)
I believe the answer is:
slab
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thick slice</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for slab that I've seen before include "Broad, thick piece of wood, stone" , "Mortuary table" , "Thin flat stone" , "Thick flat piece of stone" , "Flat piece of stone or 20" .)