Crossword Genius

Lighten with a song, we hear (5)

Ross

I believe the answer is:

allay

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'lighten' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

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(Other definitions for allay that I've seen before include "Marks of blows" , "Alleviate (hunger)" , "Lessen" , "Lay to rest (fear)" , "Assuage, ease" .)

I've seen this clue in the Evening Standard.
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