Lifeless? Precisely! (4)
I believe the answer is:
This clue is a double definition.
'lifeless?' is the first definition.
('dead' can be a synonym of 'lifeless')
'precisely' is the second definition.
(Other definitions for dead that I've seen before include "Six feet under" , "Devoid of life" , "Stiff - bereft of life" , "cold" , "Late; exact" .)