Simmer with rage (6)
I believe the answer is:
seethe
(Other definitions for seethe that I've seen before include "'Boil, with anger perhaps (6)'" , "Appear as if boiling" , "Boil turbulently" , "Smoulder" , "Simmer with anger" .)
I believe the answer is:
seethe
(Other definitions for seethe that I've seen before include "'Boil, with anger perhaps (6)'" , "Appear as if boiling" , "Boil turbulently" , "Smoulder" , "Simmer with anger" .)