Buoyant article packing vitality and punch
I believe the answer is:
life belt
'buoyant article packing' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'vitality and punch' is the wordplay.
'vitality' becomes 'life' (I've seen this before).
'and' means one lot of letters go next to another.
'punch' becomes 'belt' (I can't explain this - if you can you should believe this answer much more).
'life'+'belt'='LIFE BELT'
Can you help me to learn more?
(Other definitions for life belt that I've seen before include "Aid for one in water" , "Ring for those overboard?" , "Buoyant ring to aid person in danger of drowning" , "Flotation ring" , "Buoyant safety ring" .)