Over five accessories for this decade (7)
I believe the answer is:
sixties
'this decade' is the definition.
(eg the 1960s)
'over five accessories' is the wordplay.
'over five' becomes 'six' (one more than five).
'accessories' becomes 'ties' (tie is a type of clothing accessory).
'six'+'ties'='SIXTIES'
'for' is the link.
(Other definitions for sixties that I've seen before include "The Age of Aquarius" , "some years?" , "time to retire?" .)