Crossword Genius

Is it foolish to come out in one? (4)

Ross

I believe the answer is:

rash

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'one?' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I don't see?

I cannot understand how the rest of the clue works.

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(Other definitions for rash that I've seen before include "Ill-considered - break-out" , "Eruption of spots on skin" , "not considered" , "Flood" , "Impulsive - eruption" .)

I've seen this clue in the Evening Standard.
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