Continual instances, perhaps (9)
I believe the answer is:
incessant
'continual' is the definition.
(similar in meaning)
'instances perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'instances' is an anagram of 'INCESSANT'.
(Other definitions for incessant that I've seen before include "Instances being continually repeated" , "Nine casts (anag) - nonstop" , "Never-ending" , "Without pausing" , "Perpetual, unremitting" .)