Loading a fruit drink with a powerful effect? (7,1,5)

'a powerful effect?' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'loading a fruit drink' is the wordplay.
I cannot really see how this works, but
'loading' could be 'packing' (packing is a kind of loading) and 'packing' is found in the answer.
'a' is present in the answer.
'drink' could be 'punch' (punch is an alcoholic drink) and 'punch' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...

'with' is the link.

Can you help me to learn more?