The only place to pack, as a precaution? (4,2,4)
I believe the answer is:
just in case
'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" .)