Ink-maker with bottom becoming black in lampoon (5)
I believe the answer is:
squib
'lampoon' is the definition.
(both can mean to mock or attack)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for squib that I've seen before include "piece of satire" , "Firework, burns with a fizzing noise" , "Ultimately explosive" , "one burns before producing report" , "Jumping firework" .)