The clue "Eco energy source" last appeared in the Newsday.com crossword on August 10, 2019. The correct answer for this puzzle is "BIOFUEL", a 7-letter word.
Solution BIOFUEL is 7 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is BIOFUEL with 7 letters, and the shortest is BIOFUEL with 7 letters.
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The solution is 7 letters long.