Sore calf cured out of doors (8)
I believe the answer is:
alfresco
'out of doors' is the definition.
(synonyms)
'sore calf cured' is the wordplay.
'cured' indicates an anagram.
'sore'+'calf'='sorecalf'
'sorecalf' anagrammed gives 'ALFRESCO'.
(Other definitions for alfresco that I've seen before include "Located outdoors" , "Out of doors" , "Open-air" , "where it's cool" , "exposed to the fresh air" .)