Dismantle odd Nordic riding boot (5)
I believe the answer is:
unrig
'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" .)