Rock band succeeded after seeing changes (7)
I believe the answer is:
genesis
'rock band' is the definition.
(I've seen this before)
'succeeded after seeing changes' is the wordplay.
'succeeded' becomes 's' (genealogical abbreviation).
'after' says to put letters next to each other.
'changes' indicates an anagram.
'seeing' with letters rearranged gives 'genesi'.
's' put after 'genesi' is 'GENESIS'.
(Other definitions for genesis that I've seen before include "Beginning (in the Bible)" , "Origin or formation of something" , "Bible's first book" , "the start of something" , "rock group" .)