Crossword Genius

Semicircular recess at the east end of a church (4)

Ross

I believe the answer is:

apse

(Other definitions for apse that I've seen before include "Recess with domed rof in a church" , "In sacred space" , "Architectural feature in a church" , "Semicircular end of a church, behind the altar" , "Primate holds saint to be a" .)

I've seen this clue in The Telegraph.
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