Camera accessory returned echo of the past (9)
I believe the answer is:
flashback
'echo of the past' is the definition.
(I've seen this before)
'camera accessory returned' is the wordplay.
'camera accessory' becomes 'flash' (I can't justify this - if you can you should believe this answer much more).
'returned' becomes 'back' (I've seen this before).
'flash'+'back'='FLASHBACK'
Can you help me to learn more?
(Other definitions for flashback that I've seen before include "Disturbing sudden vivid memory of a past event" , "Echo of the past" , "(In film or novel) return to a previous event or period" , "Scene depicting previous events" , "Unexpected but vivid recurrence of a past experience" .)