Such a person has much to lose (5)

I believe the answer is:

obese

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'such' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I can't see?

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

Can you help me to learn more?

(Other definitions for obese that I've seen before include "Extremely portly" , "carrying remarkable weight" , "Unhealthily large" , "Very big" , "Grossly overweight" .)

I've seen this clue in The Sun.

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