This generated successes (4)
I believe the answer is:
hits
'successes' is the definition.
(hit is a kind of success)
'this generated' is the wordplay.
'generated' is an anagram indicator.
'this' anagrammed gives 'HITS'.
(Other definitions for hits that I've seen before include "The sort of strikes" , "In the 60s these were 'groovy'" , "Pop successes" , "Raps - successful recordings" , "that please the public?" .)