Crossword Genius

One plus one is less than a dozen (6)

Ross

I believe the answer is:

eleven

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'a dozen' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for eleven that I've seen before include "Football side" , "sports team?" , "Sporting side" , "Not first team (6,6) - See 24" , "'Legs' bingo number" .)

I've seen this clue in the Evening Standard.
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