Crossword Genius

Made tamperproof (6)

Ross

I believe the answer is:

sealed

(Other definitions for sealed that I've seen before include "Airtight" , "Secured against leakage" , "Leased in secured state" , "Securely fastened" , "Fastened as in S.W.A.L.K." .)

I've seen this clue in the King Feature Syndicate.
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