Crossword Genius

Could it hurt your foot? (4)

Ross

I believe the answer is:

sock

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'foot?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
I also know that 'foot' relates to this answer.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sock that I've seen before include "This partly protects member" , "Foot covering" , "Foot garment" , "component of Christmas present" , "Wallop" .)

I've seen this clue in the Evening Standard.
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