Crossword Genius

Just one short month (3)

Ross

I believe the answer is:

dec

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'short month' is the definition.
(abbreviation for December; 'short' indicates a short form)

I can't explain the rest of the clue.

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(Other definitions for dec that I've seen before include "Ant's TV partner" , "Ant's Geordie mate on Saturday night" .)

I've seen this clue in the Evening Standard.
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