Shaped like an orange but able to change (6)
I believe the answer is:
oblate
'shaped like an orange' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?
'able to change' is the wordplay.
'change' indicates anagramming the letters.
'able'+'to'='ableto'
'ableto' is an anagram of 'OBLATE'.
'but' is the link.
Can you help me to learn more?
(Other definitions for oblate that I've seen before include "One bound to religious life" , "One dedicated to monastic life" , "dedicated individual" , "Like earth, flattened at the poles" , "Top-flattened (sphere)" .)