What does the cryptic crossword clue "Eccentric declines to be kept quiet (8)" 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.

Eccentric declines to be kept quiet (8)

Telegraph #28475 | 18 Down | 2017-07-10 flower

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Also seen in

Guardian Cryptic #22762 (2003-02-24)