Crossword Genius

One may be placed on a beach to monitor risk, according to Spooner (4,5)

Ross

I believe the answer is:

deck chair

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'one' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for deck chair that I've seen before include "Seaside seat" , "Folding seat on board" , "Portable folding seat as for ship" , "Folding canvas seat" , "Seat used on beaches" .)

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