General character that may be changing dangerously? (7)
I believe the answer is:
climate
This clue is a double definition.
'general character' is the first definition.
'that may be changing dangerously?' is the second definition.
(Other definitions for climate that I've seen before include "Cite Mal (anag.)" , "Mood" , "Lime cat (anag.)" , "General weather conditions in an area" , "The regular weather conditions of a region" .)