What does the cryptic crossword clue "Sinatra's opening, smooth number (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.

Sinatra's opening, smooth number (5)

Telegraph Cryptic #31095 | 12 Across | 2025-11-27 flower

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