Not windy (5)
I believe the answer is:
terse
'not windy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for terse that I've seen before include "Pithy among trees" , "Reset to be pithy" , "Sententious" , "Brief; abrupt" , "Curt, laconic of speech" .)