Blowy; nervous (5)
I believe the answer is:
windy
I believe this clue is a double definition.
'blowy' is the first definition.
(I know that blowy can be written as windy)
'nervous' is the second definition.
(I've seen this before)
(Other definitions for windy that I've seen before include "Timid - tempestuous" , "Conceited - nervous - registering on the Beaufort scale" , "Breezy" , "The sort of weather" , "Gusty" .)