20 across
Intervals
including
notes
a
perfect
fifth
apart
horrifying
singers?
(3,5)
Intervals including notes a perfect fifth apart horrifying singers? (3,5)
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The definition is at the end of the clue.
How the clue works
Look at horrifying singers? — that's your definition, a cheeky nod to Hitchcock's film (birds being creatures that sing, after all). The wordplay hides EB inside THIRDS (intervals), where E and B are notes a perfect fifth apart, giving you TH-EB-IRDS.