Church recess (4)
I believe the answer is:
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<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">church recess</span>' is the definition.<br/ ><span class="explanation-format__explanation">(part of a church)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for apse that I've seen before include "where praetor sat" , "may be seen in church!" , "Part of a church with the altar" , "Niche in church" , "room for an altar" .)