Everlasting night when this is nigh? (8)
I believe the answer is:
timeless
'everlasting' is the definition.
(I've seen this in another clue)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for timeless that I've seen before include "permanent" , "Lacking limits" , "Immortal" , "Eternal or unconnected with the passing hours" , "Unaffected by fashion" .)