Mantle is able to work before Casualty 's termination (6)

I believe the answer is:

canopy

(Other definitions for canopy that I've seen before include "Roof-like awning" , "Ornamental awning" , "Upper layer of a forest" , "Overhead covering, on bed or throne say" , "in the topmost branches" .)

I've seen this clue in The Independent.

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