What does the cryptic crossword clue "Queen involved in enigmatic opera that's more impenetrable (7)" mean?

The definition is "more impenetrable". The wordplay uses an anagram. anagram of QU (synonym="‘queen’") + OPAER (synonym="OPAER") = OPAQUER; definition: "more impenetrable" The answer is OPAQUER.

Queen involved in enigmatic opera that's more impenetrable (7)

Guardian Cryptic #28998 | 2 Down | 2023-02-20 flower

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