What does the cryptic crossword clue "Awful experience with dark horse (9)" mean?

The definition is "horse". The wordplay uses a charade (building blocks). NIGHT (synonym="dark") + MARE (synonym="horse") = NIGHTMARE; definition: "Awful experience" The answer is Nightmare.

Awful experience with dark horse (9)

Telegraph Prize Cryptic #3013 | 18 Across | 2019-07-21 flower

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