Crossword Genius

Very busy, but ready to dispatch preserved goods? (3-6)

Ross

I believe the answer is:

jam-packed

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'very' 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 jam-packed that I've seen before include "Completely full" , "Extremely crowded" , "Heaving" , "Stuffed" , "Chock-a-block" .)

I've seen this clue in The Independent.
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