12 across
Language
of
sections
of
Rio
eschewing
contrived
alliteration
(4,5)
Language of sections of Rio eschewing contrived alliteration (4,5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Language, referring to the late form of Latin. Taking the letters of "alliteration" and eschewing (removing) the letters of "Rio" leaves nine letters, which when contrived (anagrammed) spell LATE LATIN.