Firmly bond (6)
I believe the answer is:
cement
(Other definitions for cement that I've seen before include "Stuff that binds or bonds" , "material for bonding" , "Bind (friendship)" , "Stick together - substance used by a builder" , "Union" .)
I believe the answer is:
cement
(Other definitions for cement that I've seen before include "Stuff that binds or bonds" , "material for bonding" , "Bind (friendship)" , "Stick together - substance used by a builder" , "Union" .)