Earth for pottery (4)
I believe the answer is:
clay
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">earth for pottery</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 clay that I've seen before include "Moulding material" , "Basis of pottery" , "Type of soil used in ceramics" , "Raw material for pottery" , "Tenacious ductile earth" .)