Crossword Genius

Stuff in case emptied out after gold turned up in container (7)

Ross

I believe the answer is:

trounce

'stuff' is the definition.
(both can mean to defeat)

I don't understand the remainder of the clue.

(Other definitions for trounce that I've seen before include "Aged skip" , "Beat badly in recount" , "Flog" , "Massacre" , "Beat roundly" .)

I've seen this clue in The Times.
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