Kind of family with funny uncle caught abandoning car (7)
I believe the answer is:
nuclear
'kind' is the definition.
(I have seen 'kind of war' mean 'nuclear' so perhaps 'kind' could also mean 'nuclear')
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for nuclear that I've seen before include "power source" , "These weapons release atomic energy" , "type of power supply" , "Relating to atomic structure" , "Using fission or fusion" .)