Crossword Genius

Spare change? (4)

Ross

I believe the answer is:

tyre

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This clue could be a double definition.

'spare' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'change?' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for tyre that I've seen before include "Something with a tread" , "A spare one around the tummy is fat" , "Biblical town" , "subject to inflation" , "Rubber wheel-ring" .)

I've seen this clue in The Sun.
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