Crossword Genius

Hymn needing organ briefly? Arranged without one, in fact (10)

Ross

I believe the answer is:

magnificat

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'hymn' is the definition.
(Magnificat is an example)

I cannot understand how the rest of the clue works.

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(Another definition for magnificat that I've seen is " Song of the Virgin Mary".)

I've seen this clue in The Independent.
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