Packing items of PPE, they'll help deliver jabs (6,6)

I believe the answer is:

boxing gloves

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'ppe they'll help deliver jabs' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'packing items' is the wordplay.
'packing' becomes 'boxing' (synonyms).
'items' becomes 'gloves' (I can't explain this - if you can you should believe this answer much more).
'boxing'+'gloves'='BOXING-GLOVES'

'of' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.

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