Walk casually in street, wind behind (6)
I believe the answer is:
stroll
'walk casually' is the definition.
(to stroll is to walk casually or leisurely)
'street wind behind' is the wordplay.
'street' becomes 'st' (abbreviation).
'wind' becomes 'roll' (synonyms).
'behind' is a charade indicator (letters next to each other).
'st'+'roll'='STROLL'
'in' acts as a link.
(Other definitions for stroll that I've seen before include "A casual or leisurely walk" , "Constitutional" , "Amble along" , "A casual, relaxing walk" , "swan" .)