Extremely lazy after third day of wind (8)
I believe the answer is:
easterly
'wind' is the definition.
(easterly is a kind of wind)
'extremely lazy after third day' is the wordplay.
'extremely' means to remove the middle letters.
'after' is a charade indicator (letters next to each other).
'third day' becomes 'easter' (third day after Jesus' crucifixion).
'lazy' with its middle taken out is 'ly'.
'ly' put after 'easter' is 'EASTERLY'.
'of' is the link.
(Other definitions for easterly that I've seen before include "Of wind, blowing from direction of rising sun" , "Invariably cold wind" , "Year's let (anag) - direction of 15" , "Wind to westward" , "bitter blow for the UK" .)