Crossword Genius

Thug is not precise (5)

Ross

I believe the answer is:

rough

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'thug' is the definition.
(both can mean a violent person)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for rough that I've seen before include "'Coarse, rugged (5)'" , "scratchy" , "Approximate - rudimentary" , "Violent type" , "Hooligan - lacking refinement" .)

I've seen this clue in The Daily Express.
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