Potter's unorthodox demonstration (7)

I believe the answer is:

protest

'demonstration' is the definition.
(thesaurus)

'potter's unorthodox' is the wordplay.
'unorthodox' indicates an anagram.
'potters' anagrammed gives 'PROTEST'.

(Other definitions for protest that I've seen before include "Demonstrate" , "Object loudly" , "Public demonstration" , "State objection" , "Complain" .)

I've seen this clue in The Times.

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