Old hat and luger originally held up outlaw (5)

I believe the answer is:

banal

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'old hat' is the definition.
(I've seen this in another clue)

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

(Other definitions for banal that I've seen before include "boringly dull" , "Overfamiliar through overuse" , "Tediously commonplace" , "Uninspiring" , "Lacking originality" .)

I've seen this clue in the Sydney Morning Herald.

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