When Dan and Sal get together, there’s something afoot (6)

I believe the answer is:

sandal

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'something afoot' is the definition.
(whimsically, something worn on a foot)

'when dan and sal get together' is the wordplay.
'and sal' anagrams to 'SANDAL'.
However, I'm not sure how the anagram is indicated.

'there's' acts as a link.

Can you help me to learn more?

(Other definitions for sandal that I've seen before include "An open shoe for summer" , "Light footwear" , "Item of footwear" , "Light open-toed shoe" , "Informal shoe" .)

I've seen this clue in the Evening Standard.

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