Shelter in street in unpleasant weather (5)

I believe the answer is:

sleet

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'unpleasant weather' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(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" .)

I've seen this clue in The Sun.

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