Shifty (7)
I believe the answer is:
evasive
'shifty' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for evasive that I've seen before include "Avoiding self-revelation" , "Ambiguous" , "Shifty, slippery" , "make out-of-the-way sort of action" , "Shifty, not giving straight answers" .)