Crossword Genius

Long-barrelled firearm with a spirally grooved interior (5)

Ross

I believe the answer is:

rifle

(Other definitions for rifle that I've seen before include "Lifer (anag.)" , "Rummage" , "Gun; sack" , "lock, stock and barrel" , "Security provider with stock" .)

I've seen this clue in The Mirror.
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