Sharply irritable (7)
I believe the answer is:
waspish
'sharply irritable' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for waspish that I've seen before include "Splenetic" , "'Very irritable, like a stinger (7)'" , "irascible" , "Bad-tempered like striped insect" , "stingy?" .)