A court poser may be set by him (10)

I believe the answer is:

prosecutor

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'set by him' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'a court poser may be' is the wordplay.
'may be' is an anagram indicator.
'court'+'poser'='courtposer'
'courtposer' anagrammed gives 'PROSECUTOR'.

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(Other definitions for prosecutor that I've seen before include "Legal official" , "originator of suit" , "Lawyer" , "One making case against defendant" , "One stating the case against a defendant" .)

I've seen this clue in The Irish Independent.

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