Something afoot when boats are wrecked (5)

I believe the answer is:

sabot

I'm a little stuck... Click here to teach me more about this clue!

'something afoot' is the definition.
I can't tell whether this definition defines the answer.

'boats are wrecked' is the wordplay.
'are wrecked' is an anagram indicator.
'boats' with letters rearranged gives 'SABOT'.

'when' is the link.

Can you help me to learn more?

(Other definitions for sabot that I've seen before include "Simple shoe" , "Boast about wooden shoe" , "French clog" , "Wooden-soled 13 down" , "Boast (anag) - shoe" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.