Crossword Genius

According to the radio, both of us will do circles in the air (5)

Ross

I believe the answer is:

wheel

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'air' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for wheel that I've seen before include "Gyrate" , "Circular frame - old instrument of torture" , "Change direction as if on an axis" , "Turn in a wide circle" , "A unicycle has one" .)

I've seen this clue in the Sydney Morning Herald.
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