Be extremely agitated with anger (6)
I believe the answer is:
seethe
(Other definitions for seethe that I've seen before include "be incensed" , "Bubble away" , "Feel intense rage" , "froth" , "Smoulder" .)
I believe the answer is:
seethe
(Other definitions for seethe that I've seen before include "be incensed" , "Bubble away" , "Feel intense rage" , "froth" , "Smoulder" .)