Irritably impatient (5)
I believe the answer is:
testy
'irritably impatient' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for testy that I've seen before include "Irritably impatient" , "Short-tempered" , "Easily annoyed" , "Easily irritated" , "Showing irritation" .)