What does the cryptic crossword clue "Most remarkable everyone's taking part in challenge? (7)" 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.

Most remarkable everyone's taking part in challenge? (7)

Guardian Cryptic #26516 | 7 Down | 2015-03-11 flower

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Most remarkable every­one's taking part in challenge? (7)

Most remarkable everyone's taking part in challenge? (7)