Crossword Genius

Lecture given by moaners, who've somehow lost an article (6)

Ross

I believe the answer is:

sermon

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'lecture' is the definition.
(sermon is a kind of lecture)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sermon that I've seen before include "minister's speech" , "Address of a religious nature" , "Preachment" , "Homily" , "Speech in church" .)

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