Crossword Genius

Complaint following group of footballers' language (5)

Ross

I believe the answer is:

farsi

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'language' is the definition.
(I know that Farsi is a natural language)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for farsi that I've seen before include "Iran's official language" , "Language of Iran" , "Modern Persian lang." , "foreign language" , "Persian language" .)

I've seen this clue in The Independent.
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