Such food as one gets at formal dinners? (7)

I believe the answer is:

starchy

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'such' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for starchy that I've seen before include "Stiff and formalistic" , "Stiff, like potatoes" , "Stiff, formal" , "Conventional" , "Unbending" .)

I've seen this clue in the Evening Standard.

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