Rue gory villainy (7)

I believe the answer is:

roguery

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'villainy' is the definition.
(thesaurus)

'rue gory' is the wordplay.
'rue gory' can be anagrammed to 'ROGUERY'.
However, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for roguery that I've seen before include "Mischievous behaviour" , "Mischievousness -- rascally tricks" , "Mischievous acts" .)

I've seen this clue in The Irish Independent.

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