Came down and brightened up (3)
I believe the answer is:
lit
I believe this clue is a double definition.
'came down' is the first definition.
(light or alight can mean to land)
'brightened up' is the second definition.
(I've seen this in another clue)
'and' is the link.
(Other definitions for lit that I've seen before include "Illuminated" , "Enlightened" , "Set alight" , "Fired" , "Creative writing, in short" .)