Malign, ominous (8)
I believe the answer is:
sinister
This clue is a double definition.
'malign' is the first definition.
(I've seen this before)
'ominous' is the second definition.
(I know that ominous can be written as sinister)
(Other definitions for sinister that I've seen before include "Threatening the left in heraldry" , "Spooky" , "'Ominous, baleful (8)'" , "Disturbing" , "Suggestive of evil/harm" .)