Cathedral area (4)
I believe the answer is:
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<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cathedral area</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 apse that I've seen before include "Recess at east end of church" , "Church recess with domed or arched roof" , "place in church" , "inside church?" , "Rounded end of building" .)