Fanatic stomaching disrespect - for their choice of clothing? (6)

I believe the answer is:

nudist

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'fanatic' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for nudist that I've seen before include "Someone choosing not to wear clothes" , "I want to be 12 [NAKED]" , "One not covered" , "One going naked" , "he reveals all" .)

I've seen this clue in The Independent.

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