In suspense (2,11)
I believe the answer is:
on tenterhooks
'in suspense' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for on tenterhooks that I've seen before include "In agitated suspense" , "Keyed up in anticipation" , "In impatient suspense" , "In great suspense" , "Nervously expectant" .)