It's a tradition (6)

I believe the answer is:

custom

'it's a tradition' is the definition.
(synonyms)

This is all the clue.

(Other definitions for custom that I've seen before include "Established usage" , "Habitual patronage" , "Traditional activity or practice" , "Traditional usage" , "Usual practice" .)

I've seen this clue in The Washington Post, the New York Times, The Irish Times and the Irish Times (Simplex).

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