Crossword Genius

Such a barrel hasnt yet been rifled (6)

Ross

I believe the answer is:

smooth

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'such' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I can't see?

I cannot understand how the remainder of the clue works.

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(Other definitions for smooth that I've seen before include "Unlined, unwrinkled" , "Even; without jerks" , "Free from roughness, bumps etc." , "Not rough or wrinkled" , "Polished" .)

I've seen this clue in The Irish News.
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