Buckle up, as a seat belt (6)
I believe the answer is:
fasten
(Other definitions for fasten that I've seen before include "Tie or join together, fix firmly" , "Fix -- make tight" , "Affix" , "Shut" , "Nail" .)
I believe the answer is:
fasten
(Other definitions for fasten that I've seen before include "Tie or join together, fix firmly" , "Fix -- make tight" , "Affix" , "Shut" , "Nail" .)