Market research company disturbed by adult language (5)

I believe the answer is:

maori

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'language' is the definition.
(Maori is an example)

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

(Other definitions for maori that I've seen before include "NZ aboriginal" , "A native from the south" , "Native of Aotearoa" , "Polynesian aboriginal" , "NZ Polynesian language" .)

I've seen this clue in The Telegraph.

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