A lot of land agreement has no disadvantage (5)

I believe the answer is:

tract

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'a lot' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

(Other definitions for tract that I've seen before include "anthem" , "lot of ground?" , "Expanse of land; treatise" , "Large area; treatise" , "Short treatise; land area" .)

I've seen this clue in The Times.

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