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It's topping, but unfashionable (3,3)

Ross

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3,3

6*

old hat

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'unfashionable' is the definition.
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(Other definitions for old hat that I've seen before include "Tediously familiar like ancient headgear" , "No longer fashionable or novel, like used headgear" , "Out of date like ancient headgear" , "Something outdated (colloq.)" , "Something out of date" .)

I've seen this clue in the Evening Standard.
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