Crossword Genius

We understand it to be communicative (7)

Ross

I believe the answer is:

english

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'communicative' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?

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

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(Other definitions for english that I've seen before include "This nationality found in shingle" , "speech" , "Widely-spoken language" , "Language of the shingle?" , "side" .)

I've seen this clue in the Evening Standard.
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