Old places unfortunately fell down (9)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
collapsed
'fell down' is the definition.
(I've seen this before)
'old places unfortunately' is the wordplay.
'unfortunately' indicates an anagram (a bad or unfortunate spelling).
'old'+'places'='oldplaces'
'oldplaces' is an anagram of 'COLLAPSED'.
(Other definitions for collapsed that I've seen before include "Gave way, caved in" , "Fell apart" , "laid low" , "Cracked up - gave way" .)