What does the cryptic crossword clue "Unusual event in diffuse nebula is not so exciting (15)" mean?

The wordplay uses a hidden word. anagram of EXCEPTION (synonym="EXCEPTION") + NEBULA (synonym="NEBULA") = UNEXCEPTIONABLE The answer is UNEXCEPTIONABLE.

Unusual event in diffuse nebula is not so exciting (15)

Guardian Cryptic #29276 | 16 Across | 2024-01-11 flower

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