A late faller (5)
I believe the answer is:
night
This could be a double definition.
'a late' is the first definition.
(I've seen this before)
'faller' is the second definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I can't see?
Can you help me to learn more?
(Other definitions for night that I've seen before include "See 8" , "'She walks in beauty, like the . . . . .' (Byron)" , "period of gloom" , "A Hard Day's (the Beatles)" , "The dark time" .)