Answer: crossbones

AnswerCrossword Clue
CROSSBONESSkull's partner
CROSSBONESPart of a certain flag
CROSSBONESSkull and ...
CROSSBONESSkull's companion
CROSSBONESSkull and ... (dire warning)
CROSSBONESPart of a symbol of danger
CROSSBONESJolly Roger's dark side?
CROSSBONESSkull accompanier
crossbonesa figure of two thigh bones laid across each other, forming with the skull a conventional emblem of death or piracy