1) Blowing off steam 2) Exclusively Saxon word 3) Exclusively Anglo word 4) Noisy 5) Ominous jungle sound 6) Romance comic 7) Sibilating 8) Sounding like a mad cat 9) The act of emitting a hiss 10) The sound of a hiss 11) Word with Anglo-Saxon origins 12) Word of purely Anglo origin Found on https://www.crosswordclues.com/clue/hissing
• (p. pr. & vb. n.) of Hiss • (n.) The occasion of contempt; the object of scorn and derision. • (n.) The act of emitting a hiss or hisses. Found on http://thinkexist.com/dictionary/meaning/hissing/
Hiss'ing noun 1. The act of emitting a hiss or hisses. 2. The occasion of contempt; the object of scorn and derision. [ Archaic] « I will make this city desolate, and a hissing .» Jer. xix. 8. Found on http://www.encyclo.co.uk/webster/H/48