One objecting to modern arts movement (12)

I believe the answer is:

demonstrator

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'one objecting' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'to modern arts movement' is the wordplay.
'movement' indicates anagramming the letters (letters move around).
'to'+'modern'+'arts'='tomodernarts'
'tomodernarts' is an anagram of 'DEMONSTRATOR'.

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(Other definitions for demonstrator that I've seen before include "showroom car" , "Participant in a public protest" , "Rally participant" , "One who shows how things work" , "Teacher - salesperson - someone on a march" .)

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

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