The most common and most likely answer to this crossword clue is the 8 letter word WASHIEST
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The straight part
We know that "faded in the extreme" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case faded in the extreme = washiest.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 WASHIEST mean?
WASHIEST adjective- Watery; damp; soft.
- Lacking substance or strength; weak; thin; dilute; feeble.
- Not firm or hardy; liable to sweat profusely with labour.