Perhaps Blair years ultimately written about as corrupt (8)
I believe the answer is:
decadent
'corrupt' is the definition.
(I've seen this before)
'perhaps blair years ultimately written about' is the wordplay.
I cannot really see how this works, but
'years' could be 'decade' (I've seen this before) and 'decade' is located in the answer.
This may be the basis of clue (or it may be nonsense).
'as' acts as a link.
Can you help me to learn more?
(Other definitions for decadent that I've seen before include "Abandoning principles" , "Symbolist" , "Decanted, being corrupt and immoral" , "Degenerate" , "Lacking in moral vigour" .)