Restlessness (10)
I believe the answer is:
impatience
'restlessness' is the definition.
(I know that restlessness can be written as impatience)
This is all the clue.
(Other definitions for impatience that I've seen before include "Unreasonable haste" , "which poor waiter reveals" , "Restlessness" , "agitation" , "embodying intolerance" .)