Mass of leaked fuel from a tanker at sea (3,5)

I think it could be either:

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3,5

oil slick

(Other definitions for oil slick that I've seen before include "Patch of floating fuel" , "Common marine spillage" , "Surface film, leaking from a ship or well" , "Film of viscous liquid floating on top of water" , "Crude contaminant" .)

I've seen this clue in The Times.

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