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An eminently high place for a flashy warning (6)

Ross

I believe the answer is:

beacon

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

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

Can you help me to learn more?

(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.
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