Something floating at sea put in a mister is a source of perfume (9)

I believe the answer is:

ambergris

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

I can't explain the rest of the clue.

(Other definitions for ambergris that I've seen before include "Sperm whale secretion used in perfumes" , "Perfume ingredient from whales" , "A waxy substance" , "part of whale" , "Wax-like substance" .)

I've seen this clue in The Times.

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