His part is arranged for one in the orchestra (7)

I believe the answer is:

harpist

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'his part is arranged for one in the orchestra' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'his part is arranged' is the wordplay.
'is arranged' indicates an anagram (letters rearranged).
'his'+'part'='hispart'
'hispart' anagrammed gives 'HARPIST'.

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(Other definitions for harpist that I've seen before include "musician" , "Stringed instrument player" , "Instrumentalist" .)

I've seen this clue in The Globe and Mail.

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