Blanket a requirement in bad weather? (8)
I believe the answer is:
umbrella
I believe this is a double definition.
'blanket' is the first definition.
(both can mean 'overall' as in an 'umbrella term')
'a requirement in bad weather?' is the second definition.
(Other definitions for umbrella that I've seen before include "Overall agency" , "Handheld collapsible canopy" , "Protecting cover" , "What goes up when rain comes down?" , "Rain shield" .)