Threatens lives, including writer screened by doctor (7)
I believe the answer is:
impends
'threatens' is the definition.
(I've seen this before)
'lives including writer screened by doctor' is the wordplay.
I cannot really see how this works, but
'writer' could be 'pen' (something which writes) and 'pen' is found within the answer.
'doctor' could be 'md' (synonyms) and 'md' is found in the leftover letters.
'lives' could be 'is' ('be' can be a synonym of 'live') and 'is' is found within the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for impends that I've seen before include "Approaches" , "Threatens" .)