Answer: ataboil

AnswerCrossword Clue
ATABOIL

Bubbling, maybe

ATABOIL

Seething

ATABOIL

Steaming mad

ATABOIL
Really hot
ATABOIL
Whistling, like some kettles
ATABOILVery hot
ATABOILVery, very hot
ATABOILHot and bubbling
ATABOILBubbling on the stove
ATABOILLike a cook's water, perhaps
ATABOILHeated, as a debate