Crossword Genius

But it doesn't stretch to music (6,4)


I believe the answer is:

rubber band

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'music' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

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

Can you help me to learn more?

(Other definitions for rubber band that I've seen before include "Elasticated loop" , "Stretchy fastener" , "use it to hold things together" , "Elastic item" , "Some bridge players" .)

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