Mean sort broke banks in Florida (9)
I believe the answer is:
skinflint
'mean sort' is the definition.
(mean can mean miserly)
'broke banks in florida' is the wordplay.
'broke' becomes 'skint' (both can mean struggling financially).
'banks' is an insertion indicator (bank can mean to surround or border).
'florida' becomes 'fl' (abbreviation for Florida).
'in'+'fl'='infl'
'skint' going around 'infl' is 'SKINFLINT'.
(Other definitions for skinflint that I've seen before include "cheapskate" , "A mean, miserly person" , "Niggard, scrooge" , "A miserly person, tightwad" , "A miserly person like Scrooge" .)