Maybe Annie's crazy (6)
I believe the answer is:
insane
'crazy' is the definition.
(I know that crazy can be written as insane)
'maybe annie's' is the wordplay.
'maybe' is an anagram indicator.
'annies' anagrammed gives 'INSANE'.
(Other definitions for insane that I've seen before include "Harebrained" , "Quite mad" , "Mental" , "out to lunch" , "Anne is (anag) - crazy" .)