Greek god of the west wind (6)
I believe the answer is:
zephyr
'greek god of the west wind' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for zephyr that I've seen before include "A soft gentle wind" , "A soft gentle breeze" , "Light wind" , "Greek god of the west wind" , "Balmy breeze" .)