Suspiciously (7)
I believe the answer is:
askance
'suspiciously' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for askance that I've seen before include "With mistrustful look" , "Distrustfully" , "(Consider) with suspicion - sideways" , "(Look) obliquely with mistrust" , "With doubt or mistrust" .)