Walk in the park in gentle wind (6)
I believe the answer is:
breeze
I believe this clue is a double definition.
'walk in the park' is the first definition.
(I've seen this before)
'gentle wind' is the second definition.
(synonyms)
'in' is the link.
(Other definitions for breeze that I've seen before include "Light to moderate wind" , "picnic" , "Light wind or small cinders" , "Kind of block" , "An easy job" .)