"Éfor spacious skies, for __ wavesÉ"

I believe the answer is:

amber

(Other definitions for amber that I've seen before include "Prepare-to-stop signal" , "Fossil resin - bream (anag)" , "Fossilised resin used in jewellery" , "Brownish yellow" , "Cautionary signal" .)

I've seen this clue in The Mirror.

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