Choking from lungs' atria not working (13)
I believe the answer is:
strangulation
'choking' is the definition.
('strangulation' can be a synonym of 'choking')
'lungs' atria not working' is the wordplay.
'working' indicates an anagram.
'lungs'+'atria'+'not'='lungsatrianot'
'lungsatrianot' with letters rearranged gives 'STRANGULATION'.
'from' acts as a link.
(Other definitions for strangulation that I've seen before include "murder" , "The choking off of a flow" , "The choking off of a blood vessel" , "Act of choking" , "Process of choking" .)