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Lifelong description of how "rock-a-bye-baby” fell to its death? (4,3,6,2,3,5)

Ross

I believe the answer is:

from the cradle to the grave

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'lifelong description' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'of how rock-a-bye-baby fell to its death?' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is present in the answer.
'rock' could be 'cradle' (synonyms) and 'cradle' is present in the answer.
'a' is present in the answer.
'baby' could be 'tot' (I've seen this before) and 'tot' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for from the cradle to the grave that I've seen before include "Progression risked by highly-active window-cleaners" , "throughout life?" , "Through all of life (4,3,6,2,3,5)" .)

I've seen this clue in The Times.
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