Again and again (10)
There are a few possibilities for this:
'again and again' is the definition.
(I've seen this before)
This is the entire clue.
(Another definition for repeatedly that I've seen is " time and again".)
'again and again' is the definition.
(thesaurus)
This is all the clue.
(Another definition for oftentimes that I've seen is " Frequently (archaic)".)
'again and again' is the definition.
(thesaurus)
This is the entire clue.
(Another definition for continuously that I've seen is " Without interruption".)