One of the "Pac-Man" ghosts (4)
I believe the answer is:
inky
'one of the pac-man ghosts' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for inky that I've seen before include "Pitch-black" , "Dark; stained" , "Like writing fluid" , "Black; drunk (Aus. sl.)" , "Leaked on by pen" .)