Courthouse limits ruled on one charged by singer? (6,4)

I believe the answer is:

celine dion

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'singer?' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'courthouse limits ruled on one charged' is the wordplay.
'limits' suggests removing the centre.
'ruled' becomes 'lined' (I've seen this before).
'on' means one lot of letters go next to another.
'one charged' becomes 'ion' (type of charged particle).
'courthouse' with its centre removed is 'ce'.
'ce'+'lined'+'ion'='CELINE DION'

'by' 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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