What does the cryptic crossword clue "Ten operas composed in largely unknown language (9)" mean?

The definition is "language". The wordplay uses an anagram. anagram of TEN + OPERAS = ESPERANTO; definition: "largely unknown language" The answer is Esperanto.

Ten operas composed in largely unknown language (9)

Telegraph Prize Cryptic #3005 | 16 Across | 2019-05-26 flower

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