Adorn sculpture of stone (7)
I believe the answer is:
festoon
'adorn' is the definition.
(I know that festoon is a more specific form of adorn)
'sculpture of stone' is the wordplay.
'sculpture' indicates an anagram.
'of'+'stone'='ofstone'
'ofstone' anagrammed gives 'FESTOON'.
(Other definitions for festoon that I've seen before include "swag" , "Decorate with strings of flowers or fabric say" , "Garland with flowers" , "Ornamental garland" , "Ornamental chain/garland" .)