Concealed handgun's a felony, and dangerous! (6)
I believe the answer is:
'dangerous' is the definition.
(I know that dangerous can be written as unsafe)
'concealed handgun's a felony' is the wordplay.
'concealed' indicates the answer is hidden within the clue.
'UNSAFE' is hidden within 'handguns a felony'.
'and' acts as a link.
(Other definitions for unsafe that I've seen before include "Unreliable" , "Dangerous - legally without basis" , "giving no protection" , "Dangerous, insecure" , "Hazardous" .)