Shelter in street in unpleasant weather (5)
I believe the answer is:
sleet
'unpleasant weather' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for sleet that I've seen before include "Mixed rain and melting snow" , "Partly frozen rain" , "Wintry precipitation" , "In foul weather" , "Mixture of rain and snow" .)