Away from wind in street in unpleasant weather (5)
I believe the answer is:
sleet
'unpleasant weather' is the definition.
(I've seen this before)
'away from wind in street' is the wordplay.
'away from wind' becomes 'lee' (lee side can mean a side sheltered from wind).
'in' means one lot of letters goes inside another.
'street' becomes 'st' (abbreviation).
'lee' inserted inside 'st' is 'SLEET'.
'in' acts as a link.
(Other definitions for sleet that I've seen before include "Partly melted falling 16 across or 18 down" , "Partly melted falling snow or hail" , "Snowy rain" , "Partially frozen rain" , "Partly frozen rain" .)