Ascending (6)
'ascending' is the definition.
('rise' can be a synonym of 'ascend')
This is all the clue.
(Other definitions for rising that I've seen before include "Moving upward" , "Revolting act" , "A revolt; getting up" , "Ascension" , "Upwardly mobile" .)
(Other definitions for upward that I've seen before include "Toward a highter place" , "Moving towards what is higher" , "Towards a higher level" , "Rising" , "To higher position" .)