Possibly claimed to be curative (7)
I believe the answer is:
medical
'be curative' is the definition.
(I've seen this in another clue)
'possibly claimed' is the wordplay.
'possibly' indicates an anagram.
'claimed' with letters rearranged gives 'MEDICAL'.
'to' acts as a link.
(Other definitions for medical that I've seen before include "Of the science dealing with treatment of disease" , "Relating to doctors" , "Relating to doctoring" , "Examination of physical health" , "Thorough health check" .)