Crossword Genius

Domed recess cathedral ultimately abandoned by mistake (4)

Ross

I believe the answer is:

apse

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'domed recess' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for apse that I've seen before include "Part of a church with the altar" , "Semicircular recess in church" , "Domed section of a church" , "Offshoot from the choir, nave or aisle in a church" , "Semicircular end of a church, behind the altar" .)

I've seen this clue in The Times.
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