Still rising in late years (3)
I believe the answer is:
yet
'still' is the definition.
('yet' can be a synonym of 'still')
'rising in late years' is the wordplay.
'rising' is a reversal indicator (going up in a down clue).
'in' indicates the answer is hidden within the clue.
'tey' is hidden in the letters of 'late years'.
'tey' back-to-front is 'YET'.
(Other definitions for yet that I've seen before include "Though; still" , "Still, even" , "Up to this time and continuing" , "Up till now" , "Still; nevertheless" .)