Cryptic crossword clue
Environmentally friendly ringleader thus becomes fraudulent substitute 4-4

The most common and most likely answer to this crossword clue is the 4 plus 4 letter word LEAD FREE

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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does LEAD FREE mean?

LEAD FREE adjective
  1. Containing no lead.
  2. (of petroleum) Containing no tetraethyl lead; unleaded.

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