Crossword Genius

Assume nothing in such a colony? (6)

Ross

I believe the answer is:

nudist

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'colony?' is the definition.
I know that 'colony' relates to this answer. I also know that both the answer and definition are singular nouns

I can't explain the remainder of the clue.

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(Other definitions for nudist that I've seen before include "S/he prefers to be naked" , "One not covered" , "One going naked" , "One who disapproves of clothes" , "one whose barely seen" .)

I've seen this clue in The Sun.
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