Potter's oven (4)
I believe the answer is:
kiln
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">potter's oven</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for kiln that I've seen before include "Industrial oven" , "Industrial furnace" , "Hops or pottery cooker?" , "Oven for firing ceramics etc" , "Pottery furnace" .)