Open to breezes (4)
I believe the answer is:
airy
'open to breezes' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for airy that I've seen before include "Spacious; nonchalant" , "Spacious - aerial" , "Flippant" , "Light and insubstantial" , "'Up the . . . . mountain / Down the rushy glen' (William Allingham)" .)