Claimed, in confusion, to be curative (9)
I believe the answer is:
medicinal
'be curative' is the definition.
(I've seen this in another clue)
'claimed in confusion' is the wordplay.
'confusion' indicates an anagram.
'claimed'+'in'='claimedin'
'claimedin' anagrammed gives 'MEDICINAL'.
'to' acts as a link.
(Other definitions for medicinal that I've seen before include "Good for you!" , "With therapeutic properties" , "of a health-giving nature?" , "Lily 15's invention" , "concerning drugs" .)