Right before ten, oust organisation marked by disorder (7)

I believe the answer is:

riotous

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'marked by disorder' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs can sometimes mean the same thing.

'right before ten oust organisation' is the wordplay.
'right' becomes 'R' (common abbreviation).
'before' means one lot of letters go next to another.
'ten' becomes 'io' (IO resembles 10).
'organisation' is an anagram indicator.
'oust' anagrammed gives 'tous'.
'r'+'io'+'tous'='RIOTOUS'

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(Other definitions for riotous that I've seen before include "Behaving wildly" , "Of mob, disorderly and unruly" , "Rowdy" , "Unrestrained, wild living perhaps" , "unmanageable" .)

I've seen this clue in the Sydney Morning Herald.

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