Crossword Genius

Period of five years (7)

Ross

I believe the answer is:

lustrum

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

This is all the clue.

(Other definitions for lustrum that I've seen before include "Period of five years" , "Five-year period" , "several years" , "Period of 20 ac years" .)

I've seen this clue in The Mirror and The Independent.
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