Just over half demonstrate Asian group of languages

I believe the answer is:

indic

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'just over' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for indic that I've seen before include "Language" , "Group of languages including Sanskrit" , "Like some tongues" .)

I've seen this clue in The Daily Mail.

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