Plant in changing climate succeeded (8)
I believe the answer is:
clematis
'plant' is the definition.
(type of plant)
'changing climate succeeded' is the wordplay.
'changing' is an anagram indicator.
'succeeded' becomes 's' (genealogical abbreviation).
'climate' is an anagram of 'clemati'.
'clemati'+'s'='CLEMATIS'
'in' is the link.
(Other definitions for clematis that I've seen before include "Ornamental climbing plant" , "Ornamental climber" , "Old man's beard" , "Popular climbing plant" , "Climbing garden plant" .)