Swimming in hot brine, a winter relaxation (11)

I believe the answer is:

hibernation

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'winter relaxation' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'swimming in hot brine a' is the wordplay.
'swimming' is an anagram indicator (letters swim around into a new order).
'in'+'hot'+'brine'+'a'='inhotbrinea'
'inhotbrinea' with letters rearranged gives 'HIBERNATION'.

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I've seen this clue in The Independent.

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