What does the cryptic crossword clue "Blue feathers (4)" 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.

Blue feathers (4)

Telegraph #27917 | 25 Across | 2015-09-26 flower

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Also seen in

Guardian Cryptic #29540 (2024-11-14) Times Sunday #5004 (2022-04-24)