Fastened, joined (8)
I believe the answer is:
attached
This clue is a double definition.
'fastened' is the first definition.
(I've seen this in another clue)
'joined' is the second definition.
(attaching is a kind of joining)
(Other definitions for attached that I've seen before include "in a relationship" , "Joined or fastened to something" , "Joined, connected" , "Bound" , "Fond and affectionate (to)" .)