Crossword Genius

Worn on the foot, it can knock you down! (4)

Ross

I believe the answer is:

sock

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

This might be a double definition.

'worn on the foot it' is the first definition.
I know that 'foot' relates to this answer.

'knock you down' is the second definition.
'sock' can be an answer for 'knock' (thesaurus). I am not sure about the 'you down' bit.

'can' acts as a link.

Can you help me to learn more?

(Other definitions for sock that I've seen before include "Foot-covering" , "One worn" , "Wallop" , "Item of footwear" , "bash" .)

I've seen this clue in the Evening Standard.
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