What does the cryptic crossword clue "Renown at intervals for a very long period (3)" mean?

The definition is "a very long period". The wordplay uses an anagram. anagram of OEN(deletion from "for") = EON The answer is EON.

Renown at intervals for a very long period (3)

Daily Mail Cryptic #17852 | 16 Down | 2026-04-08 flower