Ocean-Surface Pollution From a Tanker Spill

This page is the CodyCross answer for the clue below from Wild West, Group 424, Puzzle 4 (Native Americans).

Question is: Ocean-Surface Pollution From a Tanker Spill

and the answer is: OILSLICK

Word Meaning:

OIL SLICK — A thin film of oil floating on the surface of water, especially one that has leaked or been discharged from a ship.

Definitions from Wiktionary.