Crossword Genius

Child's new sonnet adapted Sondheim number (4,2,3,6)

Ross

I believe the answer is:

send in the clowns

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'sondheim number' is the definition.
I know nothing about this answer so I can't judge whether this works.

'child's new sonnet adapted' is the wordplay.
'adapted' is an anagram indicator.
'childs'+'new'+'sonnet'='childsnewsonnet'
'childsnewsonnet' with letters rearranged gives 'SEND IN THE CLOWNS'.

Can you help me to learn more?

(Another definition for send in the clowns that I've seen is " Sad song".)

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