Crossword Genius

One not suited for leisure activities (6)

Ross

I believe the answer is:

nudist

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'one' is the definition.
Although both the answer and definition are adjectives, I cannot understand how they can define each other.

I don't understand the remainder of the clue.

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(Other definitions for nudist that I've seen before include "he reveals all" , "One who sheds clothes in camp or on beach" , "One who disapproves of clothes" , "one whose barely seen" , "One not covered" .)

I've seen this clue in The Globe and Mail.
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