One's lowest digit? (3)

I believe the answer is:

toe

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'lowest digit?' is the definition.
(digit low on the body)

I cannot understand how the remainder of the clue works.

(Other definitions for toe that I've seen before include "'Little piggy'" , "compliantly put on line" , "Digit on foot" , "low digit" , "Conform or obey; ... the line" .)

I've seen this clue in The Mirror.

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