It's an assembly of dissenters (5)

I believe the answer is:

antis

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'dissenters' is the definition.
Both the definition and answer are plural nouns.
Perhaps there's an association between them I don't understand?

'it's an assembly' is the wordplay.
'assembly' indicates anagramming the letters.
'its'+'an'='itsan'
'itsan' anagrammed gives 'ANTIS'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for antis that I've seen before include "Opponents" , "They oppose" , "They're opposed to" , "the group voting no" , "People who are opposed" .)

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

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