Over present, Bill gets stick (6)
I believe the answer is:
adhere
'stick' is the definition.
('adhere' can be a synonym of 'stick')
'over present bill' is the wordplay.
'over' means one lot of letters go next to another.
'present' becomes 'here' ('here' can be similar in meaning to 'present').
'bill' becomes 'ad' (advertisement stuck on wall).
'here' after 'ad' is 'ADHERE'.
'gets' is the link.
(Other definitions for adhere that I've seen before include "Stick L" , "paste" , "Remain attached" , "Stick - join" , "Hold fast, stand by" .)