Part of an ecclesiastical building (4)

I believe the answer is:

apse

(Other definitions for apse that I've seen before include "Recess with domed rof in a church" , "Peas (anag) - found in church" , "Architectural feature in a church" , "Church's part" , "Peas (anag) -- part of a church" .)

I've seen this clue in The Washington Post.

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