Old band to pool skill? (10,5)

I believe the answer is:

australian crawl

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This might be a double definition.

'old band' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'pool skill?' is the second definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'to' acts as a link.

Can you help me to learn more?

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

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