Wherefore people barely go on holiday? (8)

I believe the answer is:

naturism

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

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

Can you help me to learn more?

(Other definitions for naturism that I've seen before include "Group nudity" , "Pursuit of nudity" , "letting it all hang out!" , "Nudism" , "outdoor pursuit" .)

I've seen this clue in The Times.

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