Song by Clean Bandit featuring Sean Paul and Anne-Marie that was the 2016 Christmas number one (8)
I believe the answer is:
rockabye
(Other definitions for rockabye that I've seen before include "'. . . . . . . . baby, on the tree top' (lullaby)" , "'. . . . . . . . baby, on the tree-top'" .)
I've seen this clue in The Independent.
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