The most common and most likely answer to this crossword clue is the 9 letter word TINCTURED
I've seen this crossword clue in The Times
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More clues leading to the result TINCTURED
Buddy explains!
The straight part
We know that "Stained" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stained = tinctured.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 TINCTURED mean?
TINCTURED verb- To stain or impregnate (something) with color.
- To tinge; to taint.
- To soak (an organic substance) in alcohol or another liquid to produce a tincture.