Drinking haunt permitted over year to supply promotional material (9)
I believe the answer is:
publicity
'promotional material' is the definition.
(I know that promotional material can be written as publicity)
'drinking haunt permitted over year' is the wordplay.
'drinking haunt' becomes 'pub' (I can't explain this - if you can you should believe this answer much more).
'permitted' becomes 'licit' (licit means allowed or permitted).
'over' says to put letters next to each other (in a down clue, some letters go over others).
'year' becomes 'y'.
'pub'+'licit'+'y'='PUBLICITY'
'to supply' acts as a link.
Can you help me to learn more?
(Other definitions for publicity that I've seen before include "Promotion" , "hype" , "Advertising" , "Marketing" .)