Time the thing wrong (5)
I believe the answer is:
night
'time' is the definition.
(I know that night is a type of crepuscle)
'thing wrong' is the wordplay.
'wrong' is an anagram indicator.
'thing' anagrammed gives 'NIGHT'.
'the' acts as a link.
(Other definitions for night that I've seen before include "'Red sky at . . . . ., shepherd's delight'" , "period of gloom" , "See 1 Across" , "For most, the time for sleep" , "'The 2 8 of the dog in the _____'" .)