Disorderly crooner in court (7)

I believe the answer is:

coroner

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'court' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'disorderly crooner' is the wordplay.
'disorderly' indicates an anagram.
'crooner' with letters rearranged gives 'CORONER'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for coroner that I've seen before include "He sits on cases" , "One investigating death" , "Inquest officer" , "Official holding inquests" , "Legal figure" .)

I've seen this clue in The Globe and Mail, The Irish News and The Irish Independent.

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