Enclosed tightly (6)
I believe the answer is:
sealed
(Other definitions for sealed that I've seen before include "Securely closed" , "Leased in secured state" , "Airtight" , "Closed (of lips, envelope, tomb etc)" , "Closed up, watertight" .)
I believe the answer is:
sealed
(Other definitions for sealed that I've seen before include "Securely closed" , "Leased in secured state" , "Airtight" , "Closed (of lips, envelope, tomb etc)" , "Closed up, watertight" .)