One ascends to find flowers (6)
I believe the answer is:
irises
'flowers' is the definition.
(I've seen this before)
'one ascends' is the wordplay.
'one' becomes 'i' (Roman numeral**).
'ascends' becomes 'rises' (rising is a kind of ascending).
'i'+'rises'='IRISES'
'to find' acts as a link.
(Other definitions for irises that I've seen before include "Flowers and parts of eyes" , "Plants with sword-shaped leaves" , "Flowers found in the eye" , "blooms" , "Flags" .)