Fed with ink, possibly, thus done no good at all! (6)
I believe the answer is:
knifed
'thus done no good at all' is the definition.
I can't tell whether this definition defines the answer.
'fed with ink possibly' is the wordplay.
'with' is a charade indicator (letters next to each other).
'possibly' indicates anagramming the letters.
'ink' with letters rearranged gives 'kni'.
'fed' put after 'kni' is 'KNIFED'.
Can you help me to learn more?
(Other definitions for knifed that I've seen before include "deceived furtively" , "Cut" , "Stabbed with intent to harm or kill" .)
