Dry in half a second (3)
I believe the answer is:
sec
This clue is a double definition.
'dry' is the first definition.
('dry' in French - used for wine)
'half a second' is the second definition.
(thesaurus)
'in' is the link.
(Other definitions for sec that I've seen before include "Moderately dry, champagne say" , "sparkling?" , "Mo or min?" , "Dry, like wine" , "Jiffy" .)