Rich old fop contrived to keep kids out (10)

I believe the answer is:

childproof

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'to keep kids out' is the definition.
I can't tell whether this defines the answer.

'rich old fop contrived' is the wordplay.
'contrived' is an anagram indicator.
'rich'+'old'+'fop'='richoldfop'
'richoldfop' anagrammed gives 'CHILDPROOF'.

Can you help me to learn more?

(Another definition for childproof that I've seen is " characteristic of a medicine bottle?".)

I've seen this clue in The Guardian and The Irish Times.

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