The odd sole (8)

I believe the answer is:

singular

I believe this is a double definition.

'the odd' is the first definition.
(thesaurus)

'sole' is the second definition.
(I've seen this before)

(Other definitions for singular that I've seen before include "Exceptional, one-off" , "Individual; extraordinary" , "Unusual, maybe unique" , "Strange - unique" , "As sheep may be, but not cattle or horses" .)

I've seen this clue in the Evening Standard.

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