A sock only suitable for one foot? (5)

I believe the answer is:

right

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'one foot?' is the definition.
(right foot)

I can't explain the rest of the clue.

(Other definitions for right that I've seen before include "Correct - starboard" , "Genuine" , "Equitable" , "Due" , "Correct - claim allowed" .)

I've seen this clue in the Evening Standard.

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