A colourful girl (6)
I believe the answer is:
violet
'a colourful girl' is the definition.
'violet' can be an answer for 'girl'. I'm unsure of the 'a colourful' bit.
'girl' is the wordplay.
I cannot quite see how this works, but
'girl' could be 'viole' and 'viole' is located in the answer.
A single letter 't' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for violet that I've seen before include "Girl's name - colour" , "See 9" , "plant" , "Reddish blue colour" , "Rainbow colour; flower" .)