How to attach a cane? (5)
I believe the answer is:
stick
I believe this clue is a double definition.
'how to attach' is the first definition.
(I know that stick is a kind of fasten)
'a cane?' is the second definition.
(cane is a kind of stick)
(Other definitions for stick that I've seen before include "See 2" , "Rod" , "Baton; gum" , "Switch < put up" , "Join firm" .)