Crossword Genius

Time in employment erasing end of idle interval (5)

Ross

I believe the answer is:

third

'interval' is the definition.
(third is a kind of interval)

I can't explain the remainder of the clue.

(Other definitions for third that I've seen before include "Ordinal number" , "Ruthless interrogation" , "Next after second" , "Last of three" , "One of three equal parts" .)

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