Crossword Genius

One flat on the bed? (4)

Ross

I believe the answer is:

sole

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'one' is the definition.
(synonyms)

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(Other definitions for sole that I've seen before include "Kind of fish - lose it" , "fish in the sea!" , "Dover - -" , "Exclusive class of fish" , "A lone flat fish?" .)

I've seen this clue in the Evening Standard.
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