1) Burn 2) Burn below the surface 3) Burn slowly 4) Burn without a flame 5) Burn without flame 6) Burn without flames 7) Burn without flaming 8) Combust 9) Do a slow burn 10) Exist in latent state 11) Feel suppressed anger 12) Not quite catch fire 13) Seethe with rage 14) Show suppressed anger 15) Slow, flameless burn Found on https://www.crosswordclues.com/clue/smolder
[Transformers] Smolder is a fictional character from the Transformers series. ==Transformers: Power Core Combiners== According to his bio, Smolder is a Decepticon who holds grudges and plots revenge on his enemies with his partner Chopster. When Maketoys released promotional images of their Missile Launcher Jungle Type toy they included pho... Found on http://en.wikipedia.org/wiki/Smolder_(Transformers)