Crossword Genius

Substance that makes the skin waterproof (3)

Ross

I believe the answer is:

oil

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'substance' is the first definition.
(I know that oil is a type of organic non-mineral compound)

'the skin waterproof' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'that makes' is the link.

Can you help me to learn more?

(Other definitions for oil that I've seen before include "Crude" , "SECOND PART OF 23" , "What can be extracted" , "eg Olive" , "Fuel, lubricant" .)

I've seen this clue in the Evening Standard.
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