Answer: inksin

AnswerCrossword Clue
INKSINFills with penwork
INKSINFinalizes, as a cel
INKSINFinishes, as a cartoon
INKSINWrites, as a signature
INKSINMakes permanent, as a cel
INKSINCompletes with a pen, as a cartoon
INKSINCompletes, as a cel
INKSINFills, as black squares
INKSINWrites indelibly
INKSINBlackens