Crossword Genius

It might protect an illegal dealer (5)

Ross

I believe the answer is:

fence

I'm a little stuck... Click here to teach me more about this clue!

'protect an illegal dealer' is the definition.
'fence' can be an answer for 'protect' (fencing is a kind of protecting). I am not sure about the 'an illegal dealer' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for fence that I've seen before include "Dealer in stolen property" , "[SITTER] on this won't make a decision!" , "Railing" , "use blade" , "Enclosing barrier" .)

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