Expert examiner will demonstrate... (9)

I believe the answer is:

protester

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'will demonstrate' is the definition.
I can't tell whether this definition defines the answer.

'expert examiner' is the wordplay.
'expert' becomes 'pro' (short for professional).
'examiner' becomes 'tester' (synonyms).
'pro'+'tester'='PROTESTER'

Can you help me to learn more?

(Other definitions for protester that I've seen before include "Demonstrating kind" , "Dissident" , "Person, we hear, not content" , "Demonstrator" , "objector" .)

I've seen this clue in The Irish Times.

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