The most common and most likely answer to this crossword clue is the 8 letter word MELANOMA
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More clues leading to the result MELANOMA
Buddy explains!
The straight part
We know that "Skin tumour" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case skin tumour = melanoma.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 MELANOMA mean?
MELANOMA noun- A dark-pigmented, usually malignant tumor arising from a melanocyte and occurring most commonly in the skin.