Went to pieces finding the old places all changed (9)
I believe the answer is:
collapsed
'went to pieces' is the definition.
(to go to pieces is to collapse or break down)
'the old places all changed' is the wordplay.
'all changed' is an anagram indicator.
'old'+'places'='oldplaces'
'oldplaces' with letters rearranged gives 'COLLAPSED'.
'finding' is the link.
(Other definitions for collapsed that I've seen before include "laid low" , "Cracked up - gave way" , "Fell apart" , "Gave way, caved in" .)