When bulbs come to life? (4)
I believe the answer is:
dusk
'life?' is the definition.
The definition and answer can be both states of affairs as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for dusk that I've seen before include "Sundown" , "Eventide" , "Gloaming" , "Time of day after sunset" , "Dark twilight" .)