15 across
Verse
omitted
from
cover
song
(4)
Verse omitted from cover song (4)
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0
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The definition is at the end of the clue.
How the clue works
Right, so song is your definition there, pointing to a duet. Now start with DUVET, your bed cover, and whip out the V (that's the abbreviation for verse - "verse omitted", see), and you're left with DUET.