Dull but not raining (3)
I believe the answer is:
dry
This clue is a double definition.
'dull' is the first definition.
(I've seen this in another clue)
'not raining' is the second definition.
'but' acts as a link.
(Other definitions for dry that I've seen before include "Arid; teetotal" , "Having given up drinking" , "Parched" , "Formal" , "Avoiding alcohol" .)