Blushed because of cool and rude treatment (8)
I believe the answer is:
coloured
'blushed' is the definition.
(I've seen this before)
'cool and rude treatment' is the wordplay.
'and' says to put letters next to each other.
'treatment' indicates anagramming the letters (letters treated or processed differently).
'cool' after 'rude' is 'rudecool'.
'rudecool' with letters rearranged gives 'COLOURED'.
'because of' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for coloured that I've seen before include "It's not black or white" , "blushed" , "Rich in pigment" , "Tinted" , "Dyed" .)