The most common and most likely answer to this crossword clue is the 9 letter word CHROMATIC
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Buddy explains!

The straight part
We know that "of colour" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case of colour = chromatic.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 CHROMATIC mean?
CHROMATIC adjective- Relating to or characterised by hue.
- Having the capacity to separate spectral colours by refraction.
- Related to or using notes not belonging to the diatonic scale of the key in which a passage is written.
- Moving in semitones.
- Relating to chromatin