Stick, almost all, in tin (3)
I believe the answer is:
can
'tin' is the definition.
('can' can be a synonym of 'tin')
'stick almost all' is the wordplay.
'stick' becomes 'cane' (cane is a kind of stick).
'almost all' means to remove the last letter.
'cane' with its final letter removed is 'CAN'.
'in' acts as a link.
(Other definitions for can that I've seen before include "let go in the US" , "prison" , "Vessel" , "Preserve fruit" , "Billy" .)