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Sloppy presenter hypes a single speculative assumption (10)

Ross

I believe the answer is:

hypothesis

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'assumption' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

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(Other definitions for hypothesis that I've seen before include "conjecture" , "What's supposed" , "Tentative proposition" , "Proposed explanation" , "Guess" .)

I've seen this clue in The Irish Times.
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