Easy task in gentle wind (6)
I believe the answer is:
breeze
I believe this is a double definition.
'easy task' is the first definition.
(something easy is said to be a breeze)
'gentle wind' is the second definition.
(synonyms)
'in' acts as a link.
(Other definitions for breeze that I've seen before include "Wind that can be gentle or stiff!" , "block-maker" , "easy task to move?" , "get the wind up" , "Slight wind" .)