Crossword Genius

Cardinal's wing? (4)

Ross

I believe the answer is:

apse

(Other definitions for apse that I've seen before include "Large recess in church" , "part of cathedral" , "Architectural feature in a church" , "Semicircular recess in church" , "Projection to the east end of a church" .)

I've seen this clue in the LA Times.
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