Harmful glance? Wicked look? (4,3)
I believe the answer is:
evil eye
'wicked look?' is the definition.
(I've seen this in another clue)
'harmful glance?' is the wordplay.
'harmful' becomes 'evil' (synonyms).
'glance?' becomes 'eye' (I've seen this in another clue).
'evil'+'eye'='EVIL EYE'
(Other definitions for evil eye that I've seen before include "Bad-luck look" , "Optical sort of ancient curse" , "Gaze believed harmful" , "Stare with the power to harm?" , "Look or glance supposed to cause harm" .)