Crossword Genius

Film of petroleum floating on water (3,5)

Ross

I believe the answer is:

oil slick

(Other definitions for oil slick that I've seen before include "Film of viscous liquid floating on top of water" , "Crude contaminant" , "Patch of floating fuel" , "Common marine spillage" , "ecological problem at sea" .)

I've seen this clue in the Sydney Morning Herald.
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