What does the cryptic crossword clue "Big blow, donator proving unreliable (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.

Big blow, donator proving unreliable (7)

Telegraph Prize Cryptic #3234 | 19 Down | 2023-10-15 flower

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