What does the cryptic crossword clue "Converting one of blue or green power source (7)" mean?

The definition is "green power source". The wordplay uses anagram, charade. anagram of OFBLUE ("of blue") [anagram: "Converting"] + I (abbreviation of "one") = BIOFUEL; definition: "green power source" The answer is BIOFUEL.

Converting one of blue or green power source (7)

Guardian Cryptic #28734 | 9 Across | 2022-04-18 flower

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