. . . beverage from bean leaf's fermentation (4,2,3)

'beverage' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'bean leaf's fermentation' is the wordplay.
I cannot really see how this works, but
'bean' could be 'pinto' (pinto bean is a kind of bean) and 'pinto' is present in the answer.
an anagram of 'leaf' is 'fale' which is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

'from' acts as a link.

Can you help me to learn more?