Seal hamper with new lid? (6)

I believe the answer is:

gasket

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'seal' is the definition.
(gasket is a kind of seal)

I don't understand the remainder of the clue.

(Other definitions for gasket that I've seen before include "Seal at a pipe point" , "Thin seal" , "Compressible piece of rubber forming a seal" , "engineering part" , "Seal (in, eg, engine)" .)

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

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