Crossword Genius

Specialist trial demo (7)

Ross

I believe the answer is:

protest

'demo' is the definition.

'specialist trial' is the wordplay.
'specialist' becomes 'pro' (I've seen this in another clue).
'trial' becomes 'test' (synonyms).
'pro'+'test'='PROTEST'

(Other definitions for protest that I've seen before include "State objection" , "Disapprove" , "Record objection" , "Take exception" , "Express opposition" .)

I've seen this clue in The Times.
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