What does the cryptic crossword clue "Enthusiastic about switching it on (4)" 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.

Enthusiastic about switching it on (4)

Telegraph Prize Cryptic #3145 | 23 Across | 2022-01-30 flower

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