Trashy part, hardly colourful (4)
I believe the answer is:
ashy
'colourful' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I don't see?
'trashy part hardly' is the wordplay.
'ASHY' is hidden in amongst the letters.
However, I am not sure how this is indicated.
Can you help me to learn more?
(Other definitions for ashy that I've seen before include "Cinders must have been this" , "Leaden" , "Wan" , "Like burnt residue" , "like Cinders" .)