What does the cryptic crossword clue "Favouring potential new power source is an extravagance (9)" 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.

Favouring potential new power source is an extravagance (9)

Guardian Cryptic #29895 | 10 Across | 2026-01-05 flower

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