Crossword Genius

One held up in bad weather? (8)

Ross

I believe the answer is:

umbrella

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'one' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for umbrella that I've seen before include "Protection that can be rolled up" , "Lure lamb under it in the rain" , "What may go up when the rain comes down" , "Handheld collapsible canopy" , "Type of pine tree" .)

I've seen this clue in The Sun.
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