Smoking a family out can be bad for health (4)
I believe the answer is:
smog
'bad for health' is the definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'smoking a family out' is the wordplay.
'a family' becomes 'kin' ('kin' can be a synonym of 'family').
'out' is a deletion indicator.
'smoking' with 'kin' taken away is 'SMOG'.
'can be' is the link.
Can you help me to learn more?
(Other definitions for smog that I've seen before include "Fog polluted by smoke" , "Fog and smoke mix" , "Pollution fog" , "Bad visibility caused by emissions from chimneys" , "Industrially polluted air" .)