Prohibition is about to stick (5)
I believe the answer is:
baton
'prohibition' is the definition.
(I've seen this before)
'about to stick' is the wordplay.
'about' becomes 'on'.
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'stick' becomes 'bat' (bat is a kind of stick**).
'on' after 'bat' is 'BATON'.
'is' acts as a link.
(Other definitions for baton that I've seen before include "Controller of players" , "Conductor's wand" , "weapon" , "Staff" , "Club, stick" .)