Crossword Genius

Packed against the unexpected? (6)

Ross

I think it could be either:

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6

2,4

in case

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'packed' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Other definitions for in case that I've seen before include "For fear that" , "for emergency" , "As a precaution" , "Packed" , "Where traveller may keep clothes" .)

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