Elaborate writing found in colourful corridor (6,7)
I believe the answer is:
purple passage
'elaborate writing' is the definition.
The definition suggests a singular noun which matches the answer.
'colourful corridor' is the wordplay.
'colourful' becomes 'purple' (I can't justify this - if you can you should believe this answer much more).
'corridor' becomes 'passage' (I've seen this before).
'purple'+'passage'='PURPLE PASSAGE'
'found in' acts as a link.
Can you help me to learn more?
(Other definitions for purple passage that I've seen before include "Fine description" , "Ornate writing; pass paper glue (anag.)" , "path through heather" , "high-flown language" .)