Frustrated, foiled (8)
I believe the answer is:
thwarted
This clue is a double definition.
'frustrated' is the first definition.
(I know that frustrated can be written as thwarted)
'foiled' is the second definition.
(I know that foiled can be written as thwarted)
(Other definitions for thwarted that I've seen before include "Frustrated and foiled" , "stopped?" , "Prevented from succeeding (in something)" .)