Weather: horrible sleet traps blokes (8)
I believe the answer is:
elements
'weather' is the definition.
(I know that elements is a type of weather)
'horrible sleet traps blokes' is the wordplay.
'horrible' indicates anagramming the letters.
'traps' is an insertion indicator.
'blokes' becomes 'men' (bloke can informally mean a man).
'sleet' is an anagram of 'elets'.
'elets' enclosing 'men' is 'ELEMENTS'.
(Other definitions for elements that I've seen before include "Component parts" , "Atmospheric forces like wind and rain" , "Eg, helium and silver" , "Essential parts or the weather" , "Hydrogen, helium, ..." .)