What does the cryptic crossword clue "Dark except when sierra is to the west (7)" mean?

The definition is "Dark". The wordplay uses a charade (building blocks). S (abbreviation="sierra") + UNLESS (synonym="except") = SUNLESS; definition: "Dark" The answer is Sunless.

Dark except when sierra is to the west (7)

Telegraph Prize Cryptic #3107 | 28 Across | 2021-05-09 flower

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