What does the cryptic crossword clue "Unproven belief in fresh start under leader in parliament (11)" 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.

Unproven belief in fresh start under leader in parliament (11)

Telegraph Prize Cryptic #3200 | 7 Down | 2023-02-19 flower

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