A great deal to be had at auction (3)

I believe the answer is:

lot

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'a great deal' is the definition.
(both can mean a large amount)

I cannot understand how the rest of the clue works.

(Other definitions for lot that I've seen before include "Great deal; French river" , "Fortune" , "Unit of sale at auction" , "Auction item, great deal" , "Could there be many at the auction?" .)

I've seen this clue in The Globe and Mail.

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