Period of ten years (6)

I think it could be either:

Which length description are you looking for?:

decade

'period of ten years' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for decade that I've seen before include "Ten consecutive years" , "Ten-year period" , "number of years" , "The noughties maybe" , "Time period" .)

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

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