Cool fool outspoken about bread-baskets? (7)

I believe the answer is:

gastric

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'cool' is the definition.
Although both the answer and definition are adjectives, I cannot understand how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for gastric that I've seen before include "of the corporation?" , "Stomachic" , "Pertaining to the stomach" , "Intestinal" , "affecting stomach" .)

I've seen this clue in the Sydney Morning Herald.

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