Seem embarrassed by a brightly coloured room (6)
I believe the answer is:
redden
'seem embarrassed by a brightly' is the definition.
I can't tell whether this definition defines the answer.
'coloured room' is the wordplay.
'coloured' becomes 'red' (similar in meaning).
'room' becomes 'den' (den is a kind of room).
'red'+'den'='REDDEN'
Can you help me to learn more?
(Other definitions for redden that I've seen before include "Evaluate the nature of (something)" , "Blush, colour accordingly" , "Reveal embarrassment in colourful way" , "Blush or become flushed" , "Blush like the dawn sky" .)