Endless botched instances (9)
I believe the answer is:
incessant
'endless' is the definition.
(I've seen this before)
'botched instances' is the wordplay.
'botched' indicates anagramming the letters.
'instances' with letters rearranged gives 'INCESSANT'.
(Other definitions for incessant that I've seen before include "Instances being continually repeated" , "without a break" , "happening all the time" , "Continual and uninterrupted" , "Nine casts (anag) - nonstop" .)