Hop-drying kiln (4)
I believe the answer is:
oast
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hop-drying kiln</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 oast that I've seen before include "Kiln for drying hops or malt" , "Cooker" , "Hop-drying kiln" , "Hop-drier" , "Hop-kiln" .)