No new attire! (5)

I believe the answer is:

habit

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'attire' is the definition.
(habit is a kind of attire)

I don't understand how the remainder of the clue works.

(Other definitions for habit that I've seen before include "Acquired pattern of behaviour" , "Dress - custom - practice" , "Monk's gown or custom" , "bent" , "Addiction to a drug" .)

I've seen this clue in the Evening Standard.

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