Time possibly ripe to do wrong (6)
I believe the answer is:
period
'time possibly' is the definition.
(time is a kind of period)
'ripe to do wrong' is the wordplay.
'wrong' indicates anagramming the letters.
'ripe'+'do'='ripedo'
'ripedo' anagrammed gives 'PERIOD'.
(Other definitions for period that I've seen before include "Indefinite length of time" , "A portion of time" , "End of story" , "Duration or interval" , "Era, epoch" .)