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Negotiator gives drama lessons, except one (10)

Ross

I believe the answer is:

transactor

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'negotiator' is the definition.
(I have seen 'A negotiator' mean 'transactor' so perhaps 'negotiator' could also mean 'transactor')

'drama lessons except one' is the wordplay.
I cannot quite see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is located in the answer.
This explanation may well be incorrect...

'gives' is the link.

Can you help me to learn more?

(Other definitions for transactor that I've seen before include "Businessman" , "A negotiator" .)

I've seen this clue in The Times.
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