Old guys in hot springs, reportedly (7)

I believe the answer is:

geezers

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'old guys' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps there's a link between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for geezers that I've seen before include "Blokes" , "Odd old men" .)

I've seen this clue in The Guardian.

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