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The only place to pack, as a precaution? (4,2,4)

Ross

I believe the answer is:

just in case

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'as a precaution?' is the definition.
(I've seen this in another clue)

'the only place to pack' is the wordplay.
'the only place' becomes 'justin' (I can't justify this - if you can you should believe this answer much more).
'to pack' becomes 'case' (casing is a kind of packing).
'justin'+'case'='JUST IN CASE'

Can you help me to learn more?

(Other definitions for just in case that I've seen before include "as a precaution" , "For insurance" , "In the unlikely event of problems" , "how one should be when judging suit?" , "the judge needs to be" .)

I've seen this clue in The Telegraph.
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