Initially not correcting errors after ten years results in moral decay (9)
I believe the answer is:
decadence
'moral decay' is the definition.
'decadence' can be an answer for 'decay' (thesaurus). I'm unsure of the 'moral' bit.
'initially not correcting errors after ten years' is the wordplay.
'initially' indicates taking the first letters.
'after' means one lot of letters go next to another.
'ten years' becomes 'decade' (a decade is ten years).
The initial letters of 'not correcting errors' is 'nce'.
'nce' after 'decade' is 'DECADENCE'.
'results in' acts as a link.
Can you help me to learn more?
(Other definitions for decadence that I've seen before include "Decline in quality" , "Moral or cultural decline" , "Immoral behaviour" , "depravity" , "Progressive decline" .)