Devised this in car with celebrities Richard and Judy perhaps (9,5)

I believe the answer is:

christian names

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'richard and judy perhaps' is the definition.
I can't tell whether this definition defines the answer.

'devised this in car with celebrities' is the wordplay.
'devised' indicates an anagram.
'with' means one lot of letters go next to another.
'celebrities' becomes 'names' (as in a phrase like 'a big name in fashion').
'this'+'in'+'car'='thisincar'
'thisincar' with letters rearranged gives 'christian'.
'christian'+'names'='CHRISTIAN NAMES'

Can you help me to learn more?

I've seen this clue in The Independent.

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