Corruption centre of concern after ten years (9)
I believe the answer is:
decadence
'corruption' is the definition.
(I've seen this before)
'centre of concern after ten years' is the wordplay.
'centre of' indicates the central letters.
'after' says to put letters next to each other.
'ten years' becomes 'decade' (a decade is ten years).
The central letters of 'concern' are 'nce'.
'nce' after 'decade' is 'DECADENCE'.
(Other definitions for decadence that I've seen before include "Perishing state" , "Moral or cultural decline" , "Decline in quality" , "Immoral behaviour" , "Degeneration" .)