Lullaby

I think it could be either:

Which length description are you looking for?:

10*

cradlesong

'lullaby' is the definition.
(I know that lullaby can be written as cradlesong)

This is all the clue.

(Another definition for cradlesong that I've seen is " Lullaby".)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.