Corrupt, missing last couple for years (6)
I believe the answer is:
decade
'for years' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for decade that I've seen before include "The noughties maybe" , "The noughties, say" , "Ten consecutive years" , "Group of ten things" , "Ten-year span" .)