Policemen taught to hold stick (6)
I believe the answer is:
cement
'stick' is the definition.
(to cement something is to stick or attach it)
'policemen taught to hold' is the wordplay.
'to hold' indicates the answer is hidden within the clue (I've seen 'held' mean this).
'CEMENT' is hidden within 'policemen taught'.
(Other definitions for cement that I've seen before include "material for bonding" , "Bind (friendship)" , "Building material to bind things" , "Stuff that binds or bonds" , "bind together" .)