Look dry (3)
I believe the answer is:
air
I believe this clue is a double definition.
'look' is the first definition.
(I've seen this before)
'dry' is the second definition.
(airing is a kind of drying)
(Other definitions for air that I've seen before include "piece of music" , "distinctive quality" , "Expose" , "Simple composition" , "Of which 78% is nitrogen" .)