Some wind set relay off (8)
I believe the answer is:
easterly
'some wind' is the definition.
(easterly is a kind of wind)
'set relay off' is the wordplay.
'off' indicates an anagram.
'set'+'relay'='setrelay'
'setrelay' with letters rearranged gives 'EASTERLY'.
(Other definitions for easterly that I've seen before include "The sort of wind that brings cold air to this country" , "A wind blowing towards the west" , "Year's let (anag) - direction of 15" , "Of wind, blowing from direction of rising sun" , "large blow" .)