Thrash with stick (5)
I believe the answer is:
paste
This clue is a double definition.
'thrash' is the first definition.
(I know that thrash is a more specific form of beat)
'stick' is the second definition.
(as in sticking or pasting something down)
'with' is the link.
(Other definitions for paste that I've seen before include "An adhesive, or material for artificial gems" , "Watery cement" , "Sticky stuff" , "Tapes (anag.)" , "Dough - adhesive - gem substitute" .)