Answer: tarnish

AnswerCrossword Clue
TARNISHStain.
tarnishto dull the luster of
tarnishto become tarnished
tarnishtarnished coating or state
tarnishto dull the lustre of
tarnishto disgrace
TARNISHStain produced by end of crayon in his art, unfortunately (7)
TARNISHBesmirch
TARNISHDestroy the luster
TARNISHBesmirchment
TARNISHDiscoloration
TARNISHStain, as a rep
TARNISHDiscolor.
TARNISHGrow dull.
TARNISHSully.
TARNISHSilver flaw
TARNISHSully
TARNISHTaint
TARNISHStain, as a reputation
TARNISHStain
TARNISHLose luster