Crossword Genius

Carol opener (6)

Ross

I believe the answer is:

'carol opener' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for adeste that I've seen before include "Christmas carol '...... fideles'" , "Christmas hymn: '. . . . . . fideles'" .)

I've seen this clue in The New York Times, the LA Times and The Wall Street Journal.
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