The wild disposition (6)
I believe the answer is:
nature
This clue is a double definition.
'the wild' is the first definition.
('nature' can be a synonym of 'wild')
'disposition' is the second definition.
(thesaurus)
(Other definitions for nature that I've seen before include "Disposition, temperament" , "Mother Earth" , "All non-artificial phenomena" , "Fundamental qualities" , "Character (of a person or thing)" .)