Thing spoiling From Dusk till Dawn (5)
I believe the answer is:
night
'ifrom dusk till dawni' is the definition.
I can't tell whether this defines the answer.
'thing spoiling' is the wordplay.
'spoiling' indicates anagramming the letters.
'thing' with letters rearranged gives 'NIGHT'.
Can you help me to learn more?
(Other definitions for night that I've seen before include "From dusk until dawn" , "Opposite of day" , "The dark time" , "period of gloom" , "What proverbially follows day" .)