Florida shed housing black echo of the past (9)
I believe the answer is:
flashback
'echo of the past' is the definition.
(I've seen this before)
'florida shed housing black' is the wordplay.
'florida' becomes 'fla' (abbreviation).
'shed' becomes 'shack' ().
'housing' indicates putting letters inside.
'black' becomes 'b' (abbreviation as in pencil classifications).
'shack' enclosing 'b' is 'shback'.
'fla'+'shback'='FLASHBACK'
(Other definitions for flashback that I've seen before include "Disturbing sudden vivid memory of a past event" , "Scene from past action" , "Echo of the past" , "Scene depicting previous events" , "(Transition to) earlier scene" .)