Spooner's legitimate highland blade (8)

I believe the answer is:

claymore

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'blade' is the definition.
(I know that claymore is a type of blade)

I can't explain the rest of the clue.

(Other definitions for claymore that I've seen before include "pipe" , "Scottish Highlanders' broadsword" , "mine, sort of" , "Scottish two-edged sword" , "Two-edged broadsword" .)

I've seen this clue in The Independent.

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