My kid’s career not involved with solidified particles of once-living organisms (11,4)

I believe the answer is:

sedimentary rock

I'm a little stuck... Click here to teach me more about this clue!

'solidified particles of once-living organisms' is the definition.
I can't judge whether this definition defines the answer.

'my kid's career not involved' is the wordplay.
'involved' indicates an anagram (involved can mean confusing or complex).
'my'+'kids'+'career'+'not'='mykidscareernot'
'mykidscareernot' is an anagram of 'SEDIMENTARY ROCK'.

'with' is the link.

Can you help me to learn more?

(Another definition for sedimentary rock that I've seen is " conglomerate, say".)

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

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