Crossword Genius

A right or left one? (4)

Ross

I believe the answer is:

sock

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

This clue could be a double definition.

'a right' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

'left one?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'or' is the link.

Can you help me to learn more?

(Other definitions for sock that I've seen before include "Hit; horse's leg marking" , "Hit forcefully; footwear" , "Hit with a powerful blow" , "Wallop" , "Article to cover extremity" .)

I've seen this clue in the Evening Standard.
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