Crossword Genius

One used to handling hot things? (5)

Ross

I believe the answer is:

fence

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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 remainder of the clue.

Can you help me to learn more?

(Other definitions for fence that I've seen before include "Enclosing barrier" , "Palisade" , "Paling; criminal receiver" , "Thief's dealer" , "crook" .)

I've seen this clue in The Sun.
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