Ready to eat or be eaten? (7)

I believe the answer is:

dressed

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for dressed that I've seen before include "Clothed" , "When you buy them crabs might be" , "Like crab served up" , "Arranged" , "with mayonnaise, say" .)

I've seen this clue in The Globe and Mail.

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