Crossword Genius

Part of foot displayed in main chart (4)

Ross

I believe the answer is:

inch

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But I can't explain it at all! Could you help me understand?

(Other definitions for inch that I've seen before include "Edge (forwards)" , "Move along slowly" , "Move very slowly - a very short distance" , "2.45 cm" , "Small Scottish island" .)

I've seen this clue in The Daily Mail.
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