What does the cryptic crossword clue "Just imaginary, ultimately, mythological being (5)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Just imaginary, ultimately, mythological being (5)

Telegraph Prize Cryptic #3125 | 17 Across | 2021-09-12 flower

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