Crossword Genius

Boot bottom (4)

Ross

I believe the answer is:

sole

'boot bottom' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sole that I've seen before include "Unique" , "Underside of the foot" , "Exclusive class of fish" , "A lone flat fish?" , "O __ Mio (Neapolitan song)" .)

I've seen this clue in the USA Today and the Penny Press.
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