Something afoot at an age that's destructive (5)
I believe the answer is:
sabot
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for sabot that I've seen before include "Wooden-soled 13 down" , "footwear from Paris" , "French clog" , "Simple shoe" , "Carved shoe -- boats (anag)" .)