Nurses treated current stabbing early in the day (7)
I believe the answer is:
sunrise
'early in the day' is the definition.
'nurses treated current stabbing' is the wordplay.
'treated' is an anagram indicator.
'current' becomes 'i' (symbol for electric current).
'stabbing' is an insertion indicator (some letters stab themselves into others).
'nurses' is an anagram of 'sunrse'.
'sunrse' enclosing 'i' is 'SUNRISE'.
(Other definitions for sunrise that I've seen before include "daily event" , "Time of full daylight" , "Tequila --, cocktail" , "Daybreak" , "Type of industry" .)