26 across
Pop
group,
by
covering
single,
gets
millions
(5,1)
Pop group, by covering single, gets millions (5,1)
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The definition is at the beginning of the clue.
How the clue works
The definition is Pop group — that's your famous disco act. "By" gives you BY, which "covers" single (ONE) to make BONEY, then gets millions (M) tacked on the end to finish it off.