Support when traversing choppy Elbe? (8)
I believe the answer is:
lifebelt
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for lifebelt that I've seen before include "Ring giving support in water" , "Buoyant ring to aid person in danger of drowning" , "Ring for those overboard?" , "Aid to survival at sea" , "that may save member of the crew" .)