Auction item essentially doubled ill-gotten gains (4)

I believe the answer is:

loot

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'ill-gotten gains' is the definition.
(looted or stolen items)

I can't explain the rest of the clue.

(Other definitions for loot that I've seen before include "Prize" , "Stolen goods" , "Burglar's takings - pillage" , "Plunder and ransack" , "Haul" .)

I've seen this clue in The Irish Times.

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