Bottom of a boot (4)

I believe the answer is:

sole

(Other definitions for sole that I've seen before include "Lone; part of foot" , "Kind of fish - lose it" , "Underside of footwear" , "Fish; part of foot" , "A lonely sort of flatfish" .)

I've seen this clue in the Newsday, The Washington Post Sunday and the Newsday.com.

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