Still night before noon? (4)
I believe the answer is:
even
'still' is the definition.
(I know that still can be written as even)
'night before noon' is the wordplay.
'night before' becomes 'eve' (eve can mean the night before something).
'noon' becomes 'n' (abbreviation).
'eve'+'n'='EVEN'
(Other definitions for even that I've seen before include "neck and neck" , "like six or twelve" , "Flat, level" , "Like half the numbers" , "Short joke" .)