Crossword Genius

Certain service

Ross

I believe the answer is:

mass

'certain service' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for mass that I've seen before include "Substance; a service" , "Religious celebration" , "13 [BULK]" , "Quantity; religious service" , "Church rite; large group" .)

I've seen this clue in The New York Times.
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