What does the cryptic crossword clue "Power on train affected, without a doubt (3,7)" 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.

Power on train affected, without a doubt (3,7)

Telegraph Prize Cryptic #3112 | 14 Down | 2021-06-13 flower

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