Underhand, sneaky (7)
I believe the answer is:
devious
This clue is a double definition.
'underhand' is the first definition.
(I've seen this before)
'sneaky' is the second definition.
(I've seen this in another clue)
(Other definitions for devious that I've seen before include "Tricky or shifty" , "Not straightforward or direct" , "Machiavellian, roundabout" , "Underhand, deceitful" , "Scheming, underhand" .)