Time spent at the licence agency, seemingly (4)

I believe the answer is:

aeon

(Other definitions for aeon that I've seen before include "A very long time, an age" , "long term" , "An age; period" , "Epoch" , "An immense period of time" .)

I've seen this clue in The Wall Street Journal.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.