Plant, iris, adapts to change (10)
I believe the answer is:
aspidistra
'plant' is the definition.
(aspidistra is a kind of plant)
'iris adapts to change' is the wordplay.
'to change' indicates anagramming the letters.
'iris'+'adapts'='irisadapts'
'irisadapts' with letters rearranged gives 'ASPIDISTRA'.
(Other definitions for aspidistra that I've seen before include "Iris adapts (anag) - indoor plant" , "Plant of the lily family" , "something normally developed in-house?" , "Large houseplant" , "Star is paid (anag) - plant" .)