Change in climate’s doing for flower (8)
I believe the answer is:
clematis
'flower' is the definition.
(I've seen this before)
'change in climate's' is the wordplay.
'change in' is an anagram indicator.
'climates' with letters rearranged gives 'CLEMATIS'.
'doing for' acts as a link.
(Other definitions for clematis that I've seen before include "Buttercup relative" , "Garden climber" , "Ornamental climber" , "bloomer" , "Popular climbing plant" .)