Crossword Genius

Smooth film of oil (5)

Ross

I believe the answer is:

slick

I believe this is a double definition.

'smooth' is the first definition.
(slicking is a kind of smoothing)

'film of oil' is the second definition.
(as in an oil slick)

(Other definitions for slick that I've seen before include "Bedeck" , "it's very oily" , "Glib; oil spill" , "Unwanted floater" , "Glibly assured" .)

I've seen this clue in The Globe and Mail.
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