Domed building (7)
I believe the answer is:
rotunda
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">domed building</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 rotunda that I've seen before include "Circular building with a dome" , "Round domed room" , "circular construction" , "Round building or hall" , "Do a turn (anag) -- circular domed building" .)