Crossword Genius

Wolves grew older when put in a box (8)

Ross

I believe the answer is:

packaged

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'when put in a box' is the definition.
I can't tell whether this definition defines the answer.

'wolves grew older' is the wordplay.
'wolves' becomes 'pack' (I can't justify this - if you can you should believe this answer much more).
'grew older' becomes 'aged' ('age' can be a synonym of 'grow older').
'pack'+'aged'='PACKAGED'

Can you help me to learn more?

(Other definitions for packaged that I've seen before include "kept under wraps?" , "ready for post? - with 26d" , "Placed in container" .)

I've seen this clue in the Sydney Morning Herald.
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