Naked folk tarts in US massaged (9)

I believe the answer is:

naturists

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'naked folk tarts in us massaged' is the definition.
I can't judge whether this defines the answer.

'tarts in us massaged' is the wordplay.
'massaged' is an anagram indicator (I've seen 'massage' mean this).
'tarts'+'in'+'us'='tartsinus'
'tartsinus' is an anagram of 'NATURISTS'.

Can you help me to learn more?

(Other definitions for naturists that I've seen before include "Those going naked" , "Nudists" .)

I've seen this clue in The Independent.

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