One spent in Florida, perhaps? (6)

I believe the answer is:

dollar

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'one' is the definition.
The definition and answer can be both quantities as well as being singular nouns.
Maybe you can see a link between them that I don't see?

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

Can you help me to learn more?

(Other definitions for dollar that I've seen before include "Philip -, English poet" , "Foreign currency" , "Monetary unit - town in Clackmannanshire" , "US currency" , "Economic factors deployed as 'soft power'" .)

I've seen this clue in the Evening Standard.

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