Carelessly drag cradle thing for very young relative (5,10)

I believe the answer is:

great grandchild

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'very young relative' is the definition.
The definition suggests a singular noun which matches the answer.

'carelessly drag cradle thing' is the wordplay.
'carelessly' is an anagram indicator.
'drag'+'cradle'+'thing'='dragcradlething'
'dragcradlething' with letters rearranged gives 'GREAT-GRANDCHILD'.

'for' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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