13 across
Sacred
music
at
heart
of
saintly
shroud
rite
(7)
Sacred music at heart of saintly shroud rite (7)
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The definition is at the beginning of the clue.
How the clue works
The definition is Sacred music, meaning an introit sung at the start of a service. Taking the heart (central letters) of each word gives sa(INT)ly, sh(RO)ud and r(IT)e, which combine as INT + RO + IT to spell INTROIT.