Fat got from ducks, originally -- excellent (8)
I believe the answer is:
dripping
'fat' is the definition.
(dripping is a kind of fat)
'from ducks originally excellent' is the wordplay.
I cannot really understand how this works, but
'from' could be 'in' (I've seen this in other clues) and 'in' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'got' is the link.
Can you help me to learn more?
(Other definitions for dripping that I've seen before include "Very wet; fat from roast" , "F [FAT]" , "tap needing washer?" , "perspiring in heat?" , "Saturated" .)