Church alcove (4)
I believe the answer is:
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<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">church alcove</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 "inside church?" , "Church recess with domed or arched roof" , "space for altar" , "Recess at east end of church" , "Part of a church with the altar" .)