Crossword Genius

Dismantle odd Nordic riding boot (5)

Ross

I believe the answer is:

unrig

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'dismantle' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for unrig that I've seen before include "In rug (anag.)" , "Dismantle" , "Take tackle out" , "(Of a boat) strip of its mast, stays etc" , "Take down sails" .)

I've seen this clue in the Sydney Morning Herald.
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