Appropriate description of revolting people (7)

I believe the answer is:

riotous

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'appropriate' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

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(Other definitions for riotous that I've seen before include "Unruly U rebellious" , "Involving public disorder" , "Rollicking" , "Involving wild behaviour" , "unmanageable" .)

I've seen this clue in The Irish Independent.

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