Crossword Genius

A refuge for thieves maybe (3)

Ross

I believe the answer is:

den

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'a refuge' is the definition.
(thesaurus)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for den that I've seen before include "Animals' shelter" , "Private office" , "Hidden lair of an animal" , "Animal's home or gent's study" , "Hiding place" .)

I've seen this clue in The Globe and Mail.
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