Crossword Genius

It helps the wheels go round (3)

Ross

I believe the answer is:

oil

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

This clue could be a double definition.

'it helps the wheels' is the first definition.
The definition suggests a singular noun which matches the answer.

'round' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'go' is the link.

Can you help me to learn more?

(Other definitions for oil that I've seen before include "Type of fuel" , "SECOND PART OF 23" , "what can be seen on iceberg" , "Lubricant or petroleum" , "Liquid fuel" .)

I've seen this clue in the Evening Standard.
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