An eminently high place for a flashy warning (6)

I believe the answer is:

beacon

I'm a little stuck... Click here to teach me more about this clue!

'warning' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for beacon that I've seen before include "Directional transmitter" , "Shining light (on top of a hill?)" , "Warning light on hill or cliff" , "Light on a height for navigation or warning" , "Guiding light?" .)

I've seen this clue in The Irish Independent.

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.