The most common and most likely answer to this crossword clue is the 6 letter word ANEMIC
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The straight part
We know that "washed-out" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case washed-out = anemic.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 ANEMIC mean?
ANEMIC noun- An individual who has anemia.
- Of, pertaining to, or suffering from anemia.
- (by extension) Weak; listless; lacking power, vigor, vitality, or colorfulness.