The most common and most likely answer to this crossword clue is the 8 letter word SKY-BLUE
S
K
Y
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B
L
U
E
Buddy explains!
The straight part
We know that "Colour" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case colour = sky-blue.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 SKY-BLUE mean?
SKY-BLUE adjective- Of a vibrant light blue colour, like that of the sky on a fine day.