Such a lot is so little! (3)

I believe the answer is:

fat

I'm a little stuck... Click here to teach me more about this clue!

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

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

Can you help me to learn more?

(Other definitions for fat that I've seen before include "Adipose tissue" , "Portly" , "Like 10 ac" , "Substantial" , "eg Lard" .)

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