Wild and menacing, untamed (6)
I believe the answer is:
savage
I believe this clue is a double definition.
'wild and menacing' is the first definition.
(I've seen this before)
'untamed' is the second definition.
(similar in meaning)
(Other definitions for savage that I've seen before include "Brutally criticise" , "Uncivilised and fierce" , "poet who escaped death penalty" , "Uncivilised, vicious" , "Fierce, violent" .)