Possibly malevolent look one vile Yemeni adopts (4,3)
I believe the answer is:
evil eye
'possibly malevolent look' is the definition.
'evil eye' can be an answer for 'look' (evil eye is a kind of look). I am not certain of the 'possibly malevolent' bit.
'one vile yemeni adopts' is the wordplay.
'EVIL EYE' is hidden within the letters.
But, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for evil eye that I've seen before include "Malign influence" , "Bad-luck look" , "Gaze superstitiously thought to bring harm" , "Hex look" , "Supposedly harmful stare" .)